i'm new on android developing and i have to learn much much more. I have an activity that uses fragments. Opening main activity, it shows 3 fragments and using json i have created an Array that contains an ID and a Name. I haven't understood yet, how to put my array data in a gridview and then how use it on a fragment. Can someone help me? Here my MainActivity
public class MainActivity extends AppCompatActivity implements ActionBar.TabListener {
SectionsPagerAdapter mSectionsPagerAdapter;
ViewPager mViewPager;
String myJSON;
private ProgressDialog pDialog;
private static final String TAG_RESULTS = "result";
private static final String TAG_ID = "ID";
private static final String TAG_NAME = "Nome";
JSONArray serv_man = null;
ArrayList<HashMap<String, String>> tableList = new ArrayList<HashMap<String, String>>();
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
getData();
// Set up the action bar.
final ActionBar actionBar = getSupportActionBar();
actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
// Create the adapter that will return a fragment for each of the three
// primary sections of the activity.
mSectionsPagerAdapter = new SectionsPagerAdapter(getSupportFragmentManager());
// Set up the ViewPager with the sections adapter.
mViewPager = (ViewPager) findViewById(R.id.pager);
mViewPager.setAdapter(mSectionsPagerAdapter);
mViewPager.setOnPageChangeListener(new ViewPager.SimpleOnPageChangeListener() {
#Override
public void onPageSelected(int position) {
actionBar.setSelectedNavigationItem(position);
}
});
for (int i = 0; i < mSectionsPagerAdapter.getCount(); i++) { actionBar.addTab(actionBar.newTab().setText(mSectionsPagerAdapter.getPageTitle(i)).setTabListener(this));
}
}
protected void showList(){
try {
JSONObject jsonObj = new JSONObject(myJSON);
serv_man = jsonObj.getJSONArray(TAG_RESULTS);
for(int i=0;i<serv_man.length();i++){
JSONObject c = serv_man.getJSONObject(i);
String id = c.getString(TAG_ID);
String name = c.getString(TAG_NAME);
HashMap<String,String> persons = new HashMap<String,String>();
persons.put(TAG_NAME,name);
persons.put(TAG_ID, id);
tableList.add(persons);
}
// Here i should create view but i don't know how yet
} catch (JSONException e) {
e.printStackTrace();
}
}
public void getData(){
class GetDataJSON extends AsyncTask<String, Void, String> {
#Override
protected String doInBackground(String... params) {
DefaultHttpClient httpclient = new DefaultHttpClient(new BasicHttpParams());
HttpPost httppost = new HttpPost("http://mysite/get_collab.php");
httppost.setHeader("Content-type", "application/json");
InputStream inputStream = null;
String result = null;
try {
HttpResponse response = httpclient.execute(httppost);
HttpEntity entity = response.getEntity();
inputStream = entity.getContent();
// json is UTF-8 by default
BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream, "UTF-8"), 8);
StringBuilder sb = new StringBuilder();
String line = null;
while ((line = reader.readLine()) != null)
{
sb.append(line + "\n");
}
result = sb.toString();
Log.d("Log_Tag","xxx" + result);
// Here i can see that result is ok
} catch (Exception e) {
// Oops
Log.e("log_tag", "Error converting result " + e.toString());
}
finally {
try{if(inputStream != null)inputStream.close();}catch(Exception squish){}
}
return result;
}
#Override
protected void onPreExecute() {
super.onPreExecute();
pDialog = new ProgressDialog(MainActivity.this);
pDialog.setMessage("Obtaining list...");
pDialog.setIndeterminate(false);
pDialog.setCancelable(true);
pDialog.show();
}
#Override
protected void onPostExecute(String result){
pDialog.dismiss();
myJSON=result;
showList();
}
}
GetDataJSON g = new GetDataJSON();
g.execute();
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
#Override
public void onTabSelected(ActionBar.Tab tab, FragmentTransaction fragmentTransaction) {
// When the given tab is selected, switch to the corresponding page in
// the ViewPager.
mViewPager.setCurrentItem(tab.getPosition());
}
#Override
public void onTabUnselected(ActionBar.Tab tab, FragmentTransaction fragmentTransaction) {
}
#Override
public void onTabReselected(ActionBar.Tab tab, FragmentTransaction fragmentTransaction) {
}
public class SectionsPagerAdapter extends FragmentPagerAdapter {
public SectionsPagerAdapter(FragmentManager fm) {
super(fm);
}
#Override
public Fragment getItem(int position) {
Fragment fragment = null;
switch (position) {
case 0:
fragment = new PpFragment();
break;
case 1:
fragment = new ScndFragment();
break;
case 2:
fragment = new thrdFragment();
}
return fragment;
}
#Override
public int getCount() {
// Show 3 total pages.
return 3;
}
#Override
public CharSequence getPageTitle(int position) {
Locale l = Locale.getDefault();
switch (position) {
case 0:
return getString(R.string.title_section1).toUpperCase(l);
case 1:
return getString(R.string.title_section2).toUpperCase(l);
case 2:
return getString(R.string.title_section3).toUpperCase(l);
}
return null;
}
}
}
// I should want to create a view with a gridview that shows Name and eventually a standard picture like a card view but probably it's really too much for me. I can only hope in your help.
Thanks
I haven't understood yet, how to put my array data in a gridview and
then how use it on a fragment.
To fill GridView with the data use Adapter. Official documantation describes what kind of adapter should you use for GridView and you can find many examples of adapters in the web.
If you want your Grid to be presented on fragment, rather on Activity itself, put Grid to Fragment, rather than Activity. It's the only difference.
For education purpose I advise you to fill Grid view in Activity (put it to layout xml) and add fragments later.
In my opinion, you can put your gridview and your http request in one fragment, such as PpFragment. And then you can init your gridview by using the data you get from the internet.
Here is the gridview adapter:
Part1:
private class ImageAdapter extends BaseAdapter{
public ImageAdapter() {
}
#Override
public int getCount() {
return tableList.size();
}
#Override
public Object getItem(int position) {
return tableList.get(position); //tableList is your data source
}
#Override
public long getItemId(int position) {
return 0;
}
class ViewHolder {
TextView name;
TextView id;
}
#Override
public View getView(final int position, View convertView, ViewGroup parent) {
final ViewHolder holder;
if(convertView==null){
//layout.item is your item layout of your gridview
convertView = getLayoutInflater().inflate(R.layout.item, null);
holder = new ViewHolder();
holder.name = (TextView)convertView.findViewById(R.id.name);
holder.id = (ImageView)convertView.findViewById(R.id.id);
//name and id is your view of your gridview item, for the ID and NAME
convertView.setTag(holder);
}else{
holder = (ViewHolder) convertView.getTag();
}
holder.name.setText(tableList.get(position).get("aaaa"));
holder.id.setText(tableList.get(position).get("xxxx"));
//Here you can assign values to your TextView with the value you get from the data source.
return convertView;
}
}
You can init your gridview below:
Part2:
//view is your layout of one fragment,such as PpFragment.
GridView gridView = (GridView)view.findViewById(R.id.gridviewss);
ImageAdapter imageAdapter = new ImageAdapter();
gridView.setAdapter(imageAdapter);
the gridview layout xml:
Part3: R.id.gridviewss:
<GridView
android:id="#+id/gridviewss"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:numColumns="3"
android:horizontalSpacing="2dp"
android:verticalSpacing="7.5dp"
android:stretchMode="columnWidth"
android:gravity="center"
android:background="#F1F1F1"
android:paddingLeft="11.5dp"
android:paddingRight="11.5dp"
android:paddingTop="11.5dp"
>
</GridView>
You can start your http request(the getData() method you pasted above) in the fragment method, such as onCreateView of your fragment PpFragment, and then you can init your adapter with Part2 code when you get the data from the host(After you invoke the method showList()).
I hope this could be helpful.
Part4:
R.layout.frag_uno_item:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/id"
/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/name"
/>
</LinearLayout>
And then Fragment_Uno.java:
package com.example.stackproject;
import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.params.BasicHttpParams;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import android.app.ProgressDialog;
import android.content.Context;
import android.os.AsyncTask;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.GridView;
import android.widget.TextView;
public class Fragment_Uno extends Fragment {
String myJSON;
private ProgressDialog pDialog;
private static final String TAG_RESULTS = "result";
private static final String TAG_ID = "ID";
private static final String TAG_NAME = "Nome";
JSONArray serv_man = null;
ArrayList<HashMap<String, String>> tableList = new ArrayList<HashMap<String, String>>();
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.frag_uno, container, false);
getData();
return view;
}
protected void showList(){
try {
JSONObject jsonObj = new JSONObject(myJSON);
serv_man = jsonObj.getJSONArray(TAG_RESULTS);
for(int i=0;i<serv_man.length();i++){
JSONObject c = serv_man.getJSONObject(i);
String id = c.getString(TAG_ID);
String name = c.getString(TAG_NAME);
HashMap<String,String> persons = new HashMap<String,String>();
persons.put(TAG_NAME,name);
persons.put(TAG_ID, id);
tableList.add(persons);
}
View view = getActivity().getLayoutInflater().inflate(R.layout.frag_uno, null);
GridView gridView = (GridView) view.findViewById(R.id.gridView2);
ImageAdapter imageAdapter = new ImageAdapter();
gridView.setAdapter(imageAdapter);
} catch (JSONException e) {
e.printStackTrace();
}
}
public void getData(){
class GetDataJSON extends AsyncTask<String, Void, String> {
#Override
protected String doInBackground(String... params) {
DefaultHttpClient httpclient = new DefaultHttpClient(new BasicHttpParams());
HttpPost httppost = new HttpPost("http://etc.collab.php");
// Depends on your web service
httppost.setHeader("Content-type", "application/json");
InputStream inputStream = null;
String result = null;
try {
HttpResponse response = httpclient.execute(httppost);
HttpEntity entity = response.getEntity();
inputStream = entity.getContent();
// json is UTF-8 by default
BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream, "UTF-8"), 8);
StringBuilder sb = new StringBuilder();
String line = null;
while ((line = reader.readLine()) != null)
{
sb.append(line + "\n");
}
result = sb.toString();
Log.d("Log_Tag", "xxx" + result);
//view is your layout of one fragment,such as PpFragment.
} catch (Exception e) {
// Oops
Log.e("log_tag", "Error converting result " + e.toString());
}
finally {
try{if(inputStream != null)inputStream.close();}catch(Exception squish){}
}
return result;
}
#Override
protected void onPreExecute() {
super.onPreExecute();
// pDialog = new ProgressDialog(PpFragment.this);
// pDialog.setMessage("Obtaining list...");
// pDialog.setIndeterminate(false);
// pDialog.setCancelable(true);
// pDialog.show();
}
#Override
protected void onPostExecute(String result){
// pDialog.dismiss();
myJSON=result;
showList();
}
}
GetDataJSON g = new GetDataJSON();
g.execute();
}
public class ImageAdapter extends BaseAdapter {
private Context mContext;
private View layoutInflater;
public ImageAdapter(Context c) {
mContext = c;
}
public ImageAdapter() {
}
#Override
public int getCount() {
return tableList.size();
}
#Override
public Object getItem(int position) {
return tableList.get(position); //tableList is your data source
}
#Override
public long getItemId(int position) {
return 0;
}
class ViewHolder {
TextView name;
TextView id;
}
#Override
public View getView(final int position, View convertView, ViewGroup parent) {
final ViewHolder holder;
if (convertView == null) {
//layout.item is your item layout of your gridview
convertView = getActivity().getLayoutInflater().inflate(R.layout.frag_uno_item, null);
holder = new ViewHolder();
holder.name = (TextView)convertView.findViewById(R.id.name);
holder.id = (TextView)convertView.findViewById(R.id.id);
//name and id is your view of your gridview item, for the ID and NAME
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
holder.name.setText(tableList.get(position).get(TAG_NAME));
holder.id.setText(tableList.get(position).get(TAG_ID));
//Here you can assign values to your TextView with the value you get from the data source.
return convertView;
}
}
}
First Change this
public long getItemId(int position) {
return 0;
}
To
public long getItemId(int position) {
return position;
}
Then you need to iterate in hash map .
holder.name.setText(tableList.get(position).get("aaaa"));
holder.id.setText(tableList.get(position).get("xxxx"));`
Edited
You dont need a hashmap for this forget it .. Just Create a molel Class and create entity and getter setter for it . And set the values and then pass a arrayList of its objects to adapter . Like Below example.
public class DataObject{
private boolean success;
private String message="";
private String hash;
public String getMessage() {
return message;
}
public void setMessage(String message) {
this.message = message;
}
public boolean isSuccess() {
return success;
}
public void setSuccess(boolean success) {
this.success = success;
}
public String getHash() {
return hash;
}
public void setHash(String hash) {
this.hash = hash;
}
}
And then When you are parsing .create a object and set params to it and add it in a ArrayList .Then pass it to adapter .Thats it and Your updated method looks like
protected void showList(){
try {
JSONObject jsonObj = new JSONObject(myJSON);
serv_man = jsonObj.getJSONArray(TAG_RESULTS);
for(int i=0;i<serv_man.length();i++){
DataObject dt =new DataObject();
JSONObject c = serv_man.getJSONObject(i);
String id = c.getString(TAG_ID);
String name = c.getString(TAG_NAME);
dt.setName(name);
dt.setId();
tableList.add(dt);
}
} catch (JSONException e) {
e.printStackTrace();
}
WheretableList=new ArrayList<DataObject>();
define it at class Level and use it in your adapter class to get the text.like this ..
holder.textView.setText(tableList.get(position).getName());
Okay .let me if you face any problem
Related
I want use notifyDataSetAdpter in my list view. I read about it that i can use it when my data is updating or deleting. In my case, my whole data will show in a listView and this data i am calling from MySQL. Now, I am just displaying DB values into a list. No deletion. I want this method to show updated DB values in a list I tried using this method but it didn't work. Can you please tell me how exactly and where exactly I have to use it, in my case.
Here is my code:
See_Issue.java
package com.example.mi.mikpiadmin;
import android.app.ProgressDialog;
import android.content.Intent;
import android.os.AsyncTask;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ListAdapter;
import android.widget.ListView;
import android.widget.SimpleAdapter;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import java.util.ArrayList;
import java.util.HashMap;
public class See_Issue extends AppCompatActivity implements ListView.OnItemClickListener {
ListView listView1;
public static final String URL_GET_ISSUE = "http://10.238.4.175/new/one.php";
public static final String TAG_JSON_ARRAY="results";
public static final String TAG_ID = "id";
public static final String TAG_STORE_NAME = "store_name";
public static final String TAG_ISSUE = "issue";
public static final String TAG_DESCRIBE = "describe";
private String JSON_ISSUE_STRING;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_see__issue);
listView1=(ListView)findViewById(R.id.list_see_issue) ;
listView1.setOnItemClickListener(this);
getJSON();
}
private void showEmployee(){
JSONObject jsonObject = null;
ArrayList<HashMap<String,String>> list = new ArrayList<HashMap<String, String>>();
try {
jsonObject = new JSONObject(JSON_ISSUE_STRING);
JSONArray result = jsonObject.getJSONArray(TAG_JSON_ARRAY);
for(int i = 0; i<result.length(); i++){
JSONObject jo = result.getJSONObject(i);
String id = jo.getString(TAG_STORE_NAME);
String name = jo.getString(TAG_ISSUE);
String describe = jo.getString(TAG_DESCRIBE);
HashMap<String,String> employees = new HashMap<>();
employees.put(TAG_STORE_NAME,id);
employees.put(TAG_ISSUE,name);
employees.put(TAG_DESCRIBE,describe);
list.add(employees);
}
} catch (JSONException e) {
e.printStackTrace();
}
ListAdapter adapter = new SimpleAdapter(
See_Issue.this, list, R.layout.list_item,
new String[]{TAG_STORE_NAME,TAG_ISSUE,TAG_DESCRIBE},
new int[]{R.id.id, R.id.name, R.id.feedback});
listView1.setAdapter(adapter);
((ListAdapter) listView1.getAdapter()).notifyDataSetChanged();
}
private void getJSON(){
class GetJSON extends AsyncTask<Void,Void,String> {
private ProgressDialog loading;
#Override
protected void onPreExecute() {
super.onPreExecute();
loading = ProgressDialog.show(See_Issue.this,"Fetching Data","Wait...",false,false);
}
#Override
protected void onPostExecute(String s) {
super.onPostExecute(s);
loading.dismiss();
JSON_ISSUE_STRING = s;
showEmployee();
}
#Override
protected String doInBackground(Void... params) {
RequestHandler rh = new RequestHandler();
String s = rh.sendGetRequest(URL_GET_ISSUE);
return s;
}
}
GetJSON gj = new GetJSON();
gj.execute();
}
#Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
Intent intent = new Intent(this, See_Feedback.class);
HashMap<String,String> map =(HashMap)parent.getItemAtPosition(position);
String empId = map.get(Config.TAG_ID).toString();
intent.putExtra(Config.EMP_ID,empId);
startActivity(intent);
}
}
I hope you will help.
you can use adapter.notifyDataSetChanged(); :
Call notifyDataSetChanged() on your Adapter object once you've modified the data in that adapter.
It notifies the attached observers that the underlying data has been changed and any View reflecting the data set should refresh itself.
for exapmle
((BaseAdapter) yourListView.getAdapter()).notifyDataSetChanged();
or
adapter.notifyDataSetChanged();
you have to make few changes to achieve this-
1- make these global-
private ArrayList<HashMap<String,String>> list = new ArrayList<HashMap<String, String>>();
private HashMapAdapter adapter;
2- Write your own custom adapter class-
public class HashMapAdapter extends BaseAdapter {
private HashMap<String, String> mData = new HashMap<String, String>();
private String[] mKeys;
public HashMapAdapter(HashMap<String, String> data){
mData = data;
mKeys = mData.keySet().toArray(new String[data.size()]);
}
#Override
public int getCount() {
return mData.size();
}
#Override
public Object getItem(int position) {
return mData.get(mKeys[position]);
}
#Override
public long getItemId(int arg0) {
return arg0;
}
#Override
public View getView(int pos, View convertView, ViewGroup parent) {
String key = mKeys[pos];
String Value = getItem(pos).toString();
//do your view stuff here
return convertView;
}
public void updateData(HashMap<String, String> updatedData){
mData = updatedData;
mKeys = updatedData.keySet().toArray(new String[data.size()]);
//notifying dataset changed
notifyDataSetChanged();
}
}
3- change your showEmployee() method
private void showEmployee(){
JSONObject jsonObject = null;
ArrayList<HashMap<String,String>> list = new ArrayList<HashMap<String, String>>();
try {
jsonObject = new JSONObject(JSON_ISSUE_STRING);
JSONArray result = jsonObject.getJSONArray(TAG_JSON_ARRAY);
for(int i = 0; i<result.length(); i++){
JSONObject jo = result.getJSONObject(i);
String id = jo.getString(TAG_STORE_NAME);
String name = jo.getString(TAG_ISSUE);
String describe = jo.getString(TAG_DESCRIBE);
HashMap<String,String> employees = new HashMap<>();
employees.put(TAG_STORE_NAME,id);
employees.put(TAG_ISSUE,name);
employees.put(TAG_DESCRIBE,describe);
list.add(employees);
}
} catch (JSONException e) {
e.printStackTrace();
}
adapter = new HashMapAdapter(list);
listView1.setAdapter(adapter);
}
4- Write an update method
private void updateAdapter((HashMap<String, String> updatedData){
//This will update the adapter data and will call the notifyDatasetChanged
apater.updatedData(updatedData);
}
I am trying to parse JSON from one of my json created but I am unable to parse it an throws a null pointer exception at the showdata() method. what is it that i am missing.I have checked with the array name and the php script. How do I implement it to solve the problem
parse activity
import android.content.Intent;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
public class ParseJSON extends ActionBarActivity implements View.OnClickListener {
private String myJSONString;
private static final String JSON_ARRAY="result";
private static final String ID = "id";
//private static final String NAME ="name";
//private static final String PROFESSION= "profession";
private JSONArray users = null;
private int TRACK= 0;
private EditText editTextId;
private EditText editTextName;
private EditText editTextProf;
Button btnPrev;
Button btnNext;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_parse_json);
Intent intent =getIntent();
myJSONString = intent.getStringExtra(MainActivity.MY_JSON);
editTextId = (EditText)findViewById(R.id.editTextID);
//editTextName=(EditText)findViewById(R.id.editTextUsername);
//editTextProf=(EditText)findViewById(R.id.editTextPassword);
btnNext=(Button)findViewById(R.id.buttonNext);
btnPrev=(Button)findViewById(R.id.buttonPrev);
btnPrev.setOnClickListener(this);
btnNext.setOnClickListener(this);
extractJSON();
showData();
}
private void extractJSON() {
try {
JSONObject jsonObject = new JSONObject();
users = jsonObject.getJSONArray(JSON_ARRAY);
} catch (JSONException e) {
e.printStackTrace();
}
}
private void moveNext(){
if(TRACK<users.length()){
TRACK++;
}
showData();
}
private void movePrev(){
if(TRACK>0){
TRACK--;
}
showData();
}
private void showData(){
try{
JSONObject jsonObject= users.getJSONObject(TRACK);
editTextId.setText(jsonObject.getString(ID));
// editTextName.setText(jsonObject.getString(NAME));
// editTextProf.setText(jsonObject.getString(PROFESSION));
}catch(JSONException e){
e.printStackTrace();
}
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_parse_json, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
#Override
public void onClick(View view) {
if(view==btnNext){
moveNext();
}
else if (view==btnPrev)
movePrev();
}
}
mainactivity
import android.app.ProgressDialog;
import android.content.Intent;
import android.os.AsyncTask;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.text.method.ScrollingMovementMethod;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
public class MainActivity extends ActionBarActivity implements View.OnClickListener {
private TextView textviewJSON;
private Button buttonGet;
private Button buttonParse;
public static final String MY_JSON="MY_JSON";
public static final String JSON_URL="http://www.humanfox.com/capsule/dash.php";
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
textviewJSON=(TextView)findViewById(R.id.textViewJSON);
textviewJSON.setMovementMethod(new ScrollingMovementMethod());
buttonGet=(Button)findViewById(R.id.buttonGet);
buttonParse=(Button)findViewById(R.id.buttonParse);
buttonGet.setOnClickListener(this);
buttonParse.setOnClickListener(this);
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
#Override
public void onClick(View view) {
if (view==buttonGet){
getJSON(JSON_URL);
}
else if(view==buttonParse){
showParseActivity();
}
}
private void showParseActivity() {
Intent intent = new Intent(this, ParseJSON.class);
intent.putExtra(MY_JSON,textviewJSON.getText().toString());
startActivity(intent);
}
private void getJSON(String url){
class GetJSON extends AsyncTask<String, Void, String>{
ProgressDialog loading;
#Override
protected void onPreExecute() {
super.onPreExecute();
loading= ProgressDialog.show(MainActivity.this, "Please Wait.....",null, true , true);
}
#Override
protected String doInBackground(String... params) {
String uri=params[0];
BufferedReader bufferedReader= null;
try{
URL url = new URL(uri);
HttpURLConnection con = (HttpURLConnection) url.openConnection();
StringBuilder sb = new StringBuilder();
bufferedReader= new BufferedReader(new InputStreamReader(con.getInputStream()));
String json;
while((json= bufferedReader.readLine())!=null){
sb.append(json+"\n");
}
return sb.toString().trim();
}catch(Exception e){
return null;
}
}
#Override
protected void onPostExecute(String s) {
super.onPostExecute(s);
loading.dismiss();
}
}
GetJSON gj = new GetJSON();
gj.execute(url);
}
}
I believe the issue is with the way you are trying to iterate through the JSONArray list, try this code it is also available on Github
public class ParseJSONActivity extends AppCompatActivity {
private Button button;
private Button previous_Button;
private Button next_Button;
private ListView listView;
private ArrayList<People> peoples;
private MyAdapter adapter;
private int TRACK = 0;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_parse_json);
Toolbar toolbar = (Toolbar) findViewById(R.id.my_custom_toolbar);
setSupportActionBar(toolbar);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
initializeUI();
}
private void initializeUI() {
button = (Button) findViewById(R.id.ParseJSONActivity_ok_button);
previous_Button = (Button) findViewById(R.id.ParseJSONActivity_Previous_button);
previous_Button.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
if (peoples != null) {
if (peoples.size() > 0) {
if ((TRACK < peoples.size() - 1) && (TRACK >= 1)) {
People people = (People) listView.getItemAtPosition(--TRACK);
for (People single_item : peoples) {
single_item.setSelected(false);
}
people.setSelected(true);
adapter.notifyDataSetChanged();
}else{
TRACK = 0;
}
}
}
}
});
next_Button = (Button) findViewById(R.id.ParseJSONActivity_next_button);
next_Button.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
if (peoples != null) {
if (peoples.size() > 0) {
if (TRACK < peoples.size() - 2) {
People people = (People) listView.getItemAtPosition(++TRACK);
for (People single_item : peoples) {
single_item.setSelected(false);
}
people.setSelected(true);
adapter.notifyDataSetChanged();
}else {
System.out.println("TRACK: "+TRACK);
TRACK = 0;
}
}
}else{
System.out.println("peoples is null");
}
}
});
listView = (ListView) findViewById(R.id.ParseJSONActivity_listView);
listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
if (peoples != null) {
if (peoples.size() > 0) {
TRACK = position;
People people = (People) listView.getItemAtPosition(position);
for (People single_item : peoples) {
single_item.setSelected(false);
}
people.setSelected(true);
adapter.notifyDataSetChanged();
}
}
}
});
button.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
new DownloadJSON().execute();
}
});
}
private class DownloadJSON extends AsyncTask<Void, Void, Void> {
#Override
protected Void doInBackground(Void... params) {
try {
URL url = new URL("http://www.humanfox.com/capsule/dash.php");
HttpURLConnection httpURLConnection = (HttpURLConnection) url.openConnection();
httpURLConnection.connect();
String result = IOUtils.toString(httpURLConnection.getInputStream());
System.out.println("" + result);
if (result != null) {
JSONObject result_jsonObject = new JSONObject(result);
JSONArray result_JsonArray = result_jsonObject.getJSONArray("result");
if (result_JsonArray != null) {
if (result_JsonArray.length() > 0) {
peoples = new ArrayList<>();
for (int i = 0; i < result_JsonArray.length(); i++) {
People people = new People();
JSONObject jsonObject = result_JsonArray.getJSONObject(i);
people.setId("" + jsonObject.getString("id"));
people.setName("" + jsonObject.getString("Name"));
people.setProfession("" + jsonObject.getString("profession"));
people.setImage("" + jsonObject.getString("image"));
peoples.add(people);
}
}
}
}
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
#Override
protected void onPostExecute(Void aVoid) {
super.onPostExecute(aVoid);
if (peoples != null) {
if (peoples.size() > 0) {
adapter = new MyAdapter(getApplicationContext(), R.layout.single_item_custom_one, peoples);
listView.setAdapter(adapter);
adapter.notifyDataSetChanged();
}
}
}
}
private class MyAdapter extends ArrayAdapter {
private ArrayList<People> a_productInfos;
private Context a_context;
private LayoutInflater a_layoutInflater;
public MyAdapter(Context context, int resource, ArrayList<People> a_productInfos) {
super(context, resource, a_productInfos);
this.a_productInfos = a_productInfos;
this.a_context = context;
a_layoutInflater = LayoutInflater.from(this.a_context);
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
View row = convertView;
ViewHolder holder = null;
if (row == null) {
row = a_layoutInflater.inflate(R.layout.single_item_custom_one, parent, false);
holder = new ViewHolder();
holder.product_name = (TextView) row.findViewById(R.id.single_item_custom_one_textView);
holder.item_LinearLayout = (LinearLayout) row.findViewById(R.id.single_item_custom_one_linearLayout);
row.setTag(holder);
} else {
holder = (ViewHolder) row.getTag();
}
final People productInfo = a_productInfos.get(position);
holder.product_name.setText("" + productInfo.getName());
if (productInfo.isSelected) {
holder.item_LinearLayout.setBackgroundColor(Color.parseColor("#ff44ff"));
} else {
holder.item_LinearLayout.setBackgroundColor(Color.parseColor("#ffffff"));
}
return row;
}
class ViewHolder {
TextView product_name;
LinearLayout item_LinearLayout;
}
}
private class People {
private String id;
private String Name;
private String profession;
private String image;
boolean isSelected;
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public String getName() {
return Name;
}
public void setName(String name) {
Name = name;
}
public String getProfession() {
return profession;
}
public void setProfession(String profession) {
this.profession = profession;
}
public String getImage() {
return image;
}
public void setImage(String image) {
this.image = image;
}
public boolean isSelected() {
return isSelected;
}
public void setSelected(boolean selected) {
isSelected = selected;
}
}
}
Output:
I am using this Tutorial and its sourcecodes to make listview in android. I had implemented using this tutorial but during updating the setListAdapter i cannot update the listview dynamically.
I have gone through many stackoverflow questions and they are giving adapter.notifyDataSetChanged() as the solution. But i am unable to implement it in AsyncTask.
ItemListFragment.java
public class ItemListFragment extends ListFragment {
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View v = super.onCreateView(inflater, container, savedInstanceState);
setListAdapter(new ItemAdapter(getActivity(), setArray(getActivity())));
return v;
}
public ArrayList<Item> setArray(Context context)
{
ArrayList<Item> items = new ArrayList<Item>();
Realm realm = Realm.getInstance(context);
RealmResults<Books> bs = realm.where(Books.class).findAll();
for (int i = 0; i < bs.size(); i++) {
Bitmap url = BitmapFactory.decodeFile(bs.get(i).getCover());
String title = bs.get(i).getName();
String description = bs.get(i).getAuthor();
Item item = new Item(url, title, description);
items.add(item);
}
realm.close();
return items;
}
}
ItemAdapter.java
public class ItemAdapter extends ArrayAdapter<Item> {
public ItemAdapter(Context context, List<Item> items) {
super(context, 0, items);
}
public View getView(int position, View convertView, ViewGroup parent)
{
ItemView itemView = (ItemView) convertView;
if (null == itemView)
{
itemView = ItemView.inflate(parent);
}
itemView.setItem(getItem(position));
return itemView;
}
}
MainActivity.java
public class MainActivity extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_list);
if (BuildConfig.DEBUG)
ViewServer.get(this).addWindow(this);
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
else if (id == R.id.update) {
Update update = new Update(getApplicationContext(), MainActivity.this);
update.execute();
return true;
}
return super.onOptionsItemSelected(item);
}
#Override
protected void onDestroy() {
super.onDestroy();
if (BuildConfig.DEBUG)
ViewServer.get(this).removeWindow(this);
}
#Override
protected void onResume() {
super.onResume();
if (BuildConfig.DEBUG)
ViewServer.get(this).setFocusedWindow(this);
}
}
Update.java
public class Update extends AsyncTask<Void,Void,Void>{
private Context context;
public Activity activity;
public Update(Context context, Activity activity)
{
this.context = context;
this.activity = activity;
}
#Override
protected Void doInBackground(Void... params) {
ServerAddress = context.getString(R.string.ServerAddress);
StringExtras = context.getString(R.string.CheckBook);
Realm realm = null;
try {
URL url = new URL(ServerAddress + StringExtras);
HttpURLConnection httpURLConnection = (HttpURLConnection) url.openConnection();
httpURLConnection.setRequestMethod("GET");
httpURLConnection.setRequestProperty("Content-length", "0");
httpURLConnection.setUseCaches(false);
httpURLConnection.setAllowUserInteraction(false);
httpURLConnection.setConnectTimeout(1000);
httpURLConnection.setReadTimeout(1000);
httpURLConnection.connect();
int responseCode = httpURLConnection.getResponseCode();
Log.i("Response Code",responseCode+"");
BufferedReader br = new BufferedReader(new InputStreamReader(httpURLConnection.getInputStream()));
String InputLine;
StringBuilder response = new StringBuilder();
while ((InputLine = br.readLine()) != null)
{
response.append(InputLine);
}
br.close();
httpURLConnection.disconnect();
Log.i("Response Data", response.toString());
GsonBuilder gsonBuilder = new GsonBuilder();
Gson gson = gsonBuilder.create();
JSONArray array = new JSONArray(response.toString());
//booksList = Arrays.asList(books);
//JSONArray jsonArray = object.getJSONArray("cover");
realm = Realm.getInstance(context);
for (int i=0; i< array.length(); i++ ) {
JSONObject object = array.getJSONObject(i);
Books books = gson.fromJson(object.toString(), Books.class);
Publish(books, realm);
}
}
catch (Exception e) {
e.printStackTrace();
}
finally {
if (realm != null){
realm.close();
}
}
return null;
}
#Override
protected void onPostExecute(Void aVoid) {
super.onPostExecute(aVoid);
//i want to call the setarray that contains my database data which has been updated on `doinbackground` and update the listview accordingly.
//The below codes are just the codes that i have tried but what should i do to update the listview.
activity.runOnUiThread(new Runnable() {
#TargetApi(Build.VERSION_CODES.HONEYCOMB)
#Override
public void run() {
ItemListFragment activity1 = new ItemListFragment();
ArrayList<Item> arrayList = activity1.setArray(context);
List<Item> list = new ArrayList<Item>();
int i = 0;
for (Item item : arrayList)
{
list.add(arrayList.get(i));
i++;
}
activity1.arrayAdapter.addAll(list);
activity1.arrayAdapter.notifyDataSetChanged();
}
});
}
I am trying to update the listview from postexcution. So, how can i update the view through it.
Error From AsyncTask
just incase you need but it's not the problem
8-30 16:31:47.976 1167-1167/? E/AndroidRuntime﹕ FATAL EXCEPTION: main
java.lang.NullPointerException
at np.com.thefourthgeneration.Update$1.run(Update.java:124)
at android.app.Activity.runOnUiThread(Activity.java:4673)
at np.com.thefourthgeneration.Update.onPostExecute(Update.java:108)
at np.com.thefourthgeneration.Update.onPostExecute(Update.java:34)
at android.os.AsyncTask.finish(AsyncTask.java:631)
at android.os.AsyncTask.access$600(AsyncTask.java:177)
at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:644)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:5103)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:525)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
at dalvik.system.NativeStart.main(Native Method)
layout/activity_list
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<FrameLayout
android:id="#+id/content_frame"
android:layout_width="match_parent"
android:layout_height="match_parent"/>
</LinearLayout>
layout/list_fragment
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<ListView
android:id="#+id/listView"
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
</LinearLayout>
MainActivity
public class MainActivity extends AppCompatActivity
{
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_list);
FragmentManager fm = getFragmentManager();
itemListFragment = (ItemListFragment) fm.findFragmentByTag(ItemListFragment.class.getSimpleName());
if (itemListFragment == null) {
itemListFragment = new ItemListFragment();
FragmentTransaction fragmentTransaction = fm.beginTransaction();
fragmentTransaction.replace(R.id.content_frame, itemListFragment, ItemListFragment.class.getSimpleName());
fragmentTransaction.commit();
}
if (BuildConfig.DEBUG) {
ViewServer.get(this).addWindow(this);
}
}
#Override
protected void onDestroy() {
super.onDestroy();
if (BuildConfig.DEBUG) {
ViewServer.get(this).removeWindow(this);
}
}
#Override
protected void onResume() {
super.onResume();
if (BuildConfig.DEBUG) {
ViewServer.get(this).setFocusedWindow(this);
}
}
}
ItemListFragment
public class ItemListFragment extends Fragment
{
private ListView listView;
private ItemAdapter itemAdapter;
private ArrayList<Item> itemArrayList = new ArrayList<>();
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setRetainInstance(true);
setHasOptionsMenu(true);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.list_fragment, container, false);
itemAdapter = new ItemAdapter(getActivity(), itemArrayList);
listView = (ListView) view.findViewById(R.id.listView);
listView.setAdapter(itemAdapter);
return view;
}
#Override
public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
inflater.inflate(R.menu.menu_main, menu);
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case R.id.action_settings:
return true;
case R.id.update:
new Update(getActivity()).execute();
return true;
default:
return super.onOptionsItemSelected(item);
}
}
public class Update extends AsyncTask<Void, Void, Void>
{
private Context context;
public Update(Context context) {
this.context = context;
}
#Override
protected Void doInBackground(Void... params) {
ServerAddress = context.getString(R.string.ServerAddress);
StringExtras = context.getString(R.string.CheckBook);
Realm realm = null;
try {
URL url = new URL(ServerAddress + StringExtras);
HttpURLConnection httpURLConnection = (HttpURLConnection) url.openConnection();
httpURLConnection.setRequestMethod("GET");
httpURLConnection.setRequestProperty("Content-length", "0");
httpURLConnection.setUseCaches(false);
httpURLConnection.setAllowUserInteraction(false);
httpURLConnection.setConnectTimeout(1000);
httpURLConnection.setReadTimeout(1000);
httpURLConnection.connect();
int responseCode = httpURLConnection.getResponseCode();
Log.i("Response Code", responseCode + "");
BufferedReader br = new BufferedReader(new InputStreamReader(httpURLConnection.getInputStream()));
String InputLine;
StringBuilder response = new StringBuilder();
while ((InputLine = br.readLine()) != null) {
response.append(InputLine);
}
br.close();
httpURLConnection.disconnect();
Log.i("Response Data", response.toString());
GsonBuilder gsonBuilder = new GsonBuilder();
Gson gson = gsonBuilder.create();
JSONArray array = new JSONArray(response.toString());
//booksList = Arrays.asList(books);
//JSONArray jsonArray = object.getJSONArray("cover");
realm = Realm.getInstance(context);
for (int i = 0; i < array.length(); i++) {
JSONObject object = array.getJSONObject(i);
Books books = gson.fromJson(object.toString(), Books.class);
Publish(books, realm);
}
} catch (Exception e) {
e.printStackTrace();
} finally {
if (realm != null) {
realm.close();
}
}
return null;
}
#Override
protected void onPostExecute(Void aVoid) {
itemArrayList.clear();
itemArrayList.addAll(getArray(context));
itemAdapter.notifyDataSetChanged();
}
public ArrayList<Item> getArray(Context context) {
ArrayList<Item> items = new ArrayList<Item>();
Realm realm = Realm.getInstance(context);
RealmResults<Books> bs = realm.where(Books.class).findAll();
for (int i = 0; i < bs.size(); i++) {
Bitmap url = BitmapFactory.decodeFile(bs.get(i).getCover());
String title = bs.get(i).getName();
String description = bs.get(i).getAuthor();
Item item = new Item(url, title, description);
items.add(item);
}
realm.close();
return items;
}
}
public class ItemAdapter extends ArrayAdapter<Item>
{
public ItemAdapter(Context context, List<Item> items) {
super(context, 0, items);
}
public View getView(int position, View convertView, ViewGroup parent) {
ItemView itemView = (ItemView) convertView;
if (null == itemView) {
itemView = ItemView.inflate(parent);
}
itemView.setItem(getItem(position));
return itemView;
}
}
}
Its not the 100% work code, because i dont fully understand all structures (like Realm) and I dont test it, but its the main idea.
I have a Fragment called User Management where I collect data from a server and display it in a ListView. It's also refreshable via SwipeRefreshLayout.
What happens is, if I get data on 1-4 users, it displays the data correctly. However, if I get data on more than 4 users, it displays the first 4 correctly, and instead of the fifth, it's the first one again, instead of the 6th, it's the second one and so on and so on.
I've tried everything I could think of, the adapter is getting the data correctly, the ListView is getting the adapter correctly, but for some reason, it peaks at 4 users displayed, and simply repeats them after that (the funny thing is, if I add a user and then refresh, it simply repeats the next user one more time in the list, so it's definitely aware of the change in user number)
Can you help me finding the problem?
The java class:
package com.softwarenation.jetfuel.fragments.userManagement;
import android.app.AlertDialog;
import android.app.Fragment;
import android.app.FragmentManager;
import android.app.ListFragment;
import android.content.Context;
import android.content.DialogInterface;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.AsyncTask;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v4.widget.SwipeRefreshLayout;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.ListView;
import android.widget.RelativeLayout;
import android.widget.TextView;
import android.widget.Toast;
import com.android.volley.VolleyError;
import com.google.gson.Gson;
import com.google.gson.reflect.TypeToken;
import com.handmark.pulltorefresh.library.PullToRefreshBase;
import com.handmark.pulltorefresh.library.PullToRefreshListView;
import com.softwarenation.jetfuel.R;
import com.softwarenation.jetfuel.activities.MainActivity;
import com.softwarenation.jetfuel.fragments.Stations;
import com.softwarenation.jetfuel.managers.JetfuelManager;
import com.softwarenation.jetfuel.managers.StatusManager;
import com.softwarenation.jetfuel.managers.UserManager;
import com.softwarenation.jetfuel.utility.Global;
import com.softwarenation.jetfuel.utility.GlobalConnection;
import com.softwarenation.jetfuel.utility.users.User_pictures;
import com.softwarenation.jetfuel.utility.users.Users_mana;
import org.nicktate.projectile.Method;
import org.nicktate.projectile.Projectile;
import org.nicktate.projectile.StringListener;
import java.io.InputStream;
import java.util.ArrayList;
public class UserManagement extends Fragment {
private SwipeRefreshLayout swipeRefreshLayout;
//private View refreshView;
private Global font = new Global();
private ListView listView;
private ArrayList<User_pictures> pictureses = new ArrayList<User_pictures>();
private static boolean isfirst = false;
private PullToRefreshListView pullToRefreshView;
/**---------------------------------------------------------------------------------------------*/
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setHasOptionsMenu(true);
}
/**---------------------------------------------------------------------------------------------*/
#Nullable
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_usermanagemnet, container, false);
listView = (ListView)rootView.findViewById(R.id.list);
swipeRefreshLayout = (SwipeRefreshLayout)rootView.findViewById(R.id.swipe);
// refreshView = (View) rootView.findViewById(R.id.swipe);
//First time, we get the data from a server, then only display that data until the user calls for a refresh
if(!StatusManager.getInstance().getUsermStatus()){
UsersTask usersTask = new UsersTask();
usersTask.execute();
}else{
setContent();
}
Button addUser = (Button)rootView.findViewById(R.id.addUser_button);
addUser.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Fragment fragment = new AddUser();
FragmentManager fragmentManager = getFragmentManager();
fragmentManager.beginTransaction().replace(R.id.content_frame, fragment).commit();
}
});
// Set a listener to be invoked when the list should be refreshed.
swipeRefreshLayout.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
#Override
public void onRefresh() {
Log.e("start","onRefresh");
new GetDataTask().execute();
}
}
);
/* pullToRefreshView = (PullToRefreshListView)rootView.findViewById(R.id.pull_to_refresh_listview);
pullToRefreshView.bringToFront();
pullToRefreshView.setOnRefreshListener(new PullToRefreshBase.OnRefreshListener<ListView>() {
#Override
public void onRefresh(PullToRefreshBase<ListView> refreshView) {
// Do work to refresh the list here.
new GetDataTask().execute();
}
});*/
return rootView;
}
public void setOnRefreshListener (SwipeRefreshLayout.OnRefreshListener listener){
swipeRefreshLayout.setOnRefreshListener(listener);
}
public boolean isRefreshing(){
return swipeRefreshLayout.isRefreshing();
}
public void setRefreshing(boolean refreshing){
swipeRefreshLayout.setRefreshing(refreshing);
}
public SwipeRefreshLayout getSwipeRefreshLayout(){
return swipeRefreshLayout;
}
//on refresh, get new data from the server
private class GetDataTask extends AsyncTask<Void, Void, String[]> {
#Override
protected String[] doInBackground(Void... voids) {Log.e("start","GetDataTask");
UsersTask usersTask = new UsersTask();
usersTask.execute();
return new String[0];
}
#Override
protected void onPostExecute(String[] result) {
// Call onRefreshComplete when the list has been refreshed.
// pullToRefreshView.onRefreshComplete();
super.onPostExecute(result);
MainActivity.setBackDisabled(false);
Log.e("GetDataTask","completed");
}
}
private class SampleItem {
public String id;
public String title;
public String username;
public String groupName;
public int userPicture;
public int editPicture;
public int dPicture;
public String activated;
public SampleItem(String id, String title, String username, String groupName, int userPicture, int editPicture, int dPicture, String activated ) {
this.id = id;
this.title = title;
this.username = username;
this.groupName = groupName;
this.userPicture = userPicture;
this.editPicture = editPicture;
this.dPicture = dPicture;
this.activated = activated;
}
}
static class ViewHolder {
private String checkBox;
private RelativeLayout relativeLayout;
private LinearLayout linearLayout;
private RelativeLayout relativeLayout2;
public void setCheckBox(String checkBox) {
this.checkBox = checkBox;
}
public void setLinearLayout(LinearLayout linearLayout) {
this.linearLayout = linearLayout;
}
public void setRelativeLayout(RelativeLayout relativeLayout) {
this.relativeLayout = relativeLayout;
}
public void setRelativeLayout2(RelativeLayout relativeLayout2) {
this.relativeLayout2 = relativeLayout2;
}
public LinearLayout getLinearLayout() {
return linearLayout;
}
public RelativeLayout getRelativeLayout() {
return relativeLayout;
}
public RelativeLayout getRelativeLayout2() {
return relativeLayout2;
}
public RelativeLayout getCheckBox() {
return relativeLayout;
}
}
public class SampleAdapter extends ArrayAdapter<SampleItem> {
final ViewHolder holder = new ViewHolder();
public SampleAdapter(Context context) {
super(context, 0);
}
public View getView(final int position, View convertView, ViewGroup parent) {
if (convertView == null) {
convertView = LayoutInflater.from(getContext()).inflate(R.layout.row_usermana, null);
ImageView userPicture = (ImageView)convertView.findViewById(R.id.userpicture);
userPicture.setImageDrawable(getResources().getDrawable(getItem(position).userPicture));
TextView title = (TextView)convertView.findViewById(R.id.user_name);
font.setFont(title, 3, getActivity());
title.setText(getItem(position).title);
TextView username = (TextView)convertView.findViewById(R.id.username);
font.setFont(username, 2, getActivity());
username.setText(getItem(position).username);
TextView groupname = (TextView)convertView.findViewById(R.id.groupName);
font.setFont(groupname, 2, getActivity());
groupname.setText(getItem(position).groupName);
ImageView useredit = (ImageView)convertView.findViewById(R.id.editbutton);
useredit.setImageDrawable(getResources().getDrawable(getItem(position).editPicture));
useredit.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Bundle bundle = new Bundle();
bundle.putString("user_id", getItem(position).id);
Fragment fragment = new EditProfile();
fragment.setArguments(bundle);
FragmentManager fragmentManager = getFragmentManager();
fragmentManager.beginTransaction().replace(R.id.content_frame, fragment).commit();
}
});
/**---------------*/
ImageView userdelate = (ImageView)convertView.findViewById(R.id.deletebutton);
userdelate.setImageDrawable(getResources().getDrawable(getItem(position).dPicture));
holder.setLinearLayout((LinearLayout)convertView.findViewById(R.id.lin_show_profile));
//LinearLayout show = (LinearLayout)convertView.findViewById(R.id.lin_show_profile);
holder.getLinearLayout().setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Bundle bundle = new Bundle();
bundle.putString("user_id", getItem(position).id);
Fragment fragment = new ShowProfile();
fragment.setArguments(bundle);
FragmentManager fragmentManager = getFragmentManager();
fragmentManager.beginTransaction().replace(R.id.content_frame, fragment).commit();
}
});
//
holder.setRelativeLayout((RelativeLayout)convertView.findViewById(R.id.delate_user));
//RelativeLayout delete_user = (RelativeLayout)convertView.findViewById(R.id.delate_user);
holder.getRelativeLayout().setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
DialogStop("Are you sure?", getItem(position).username, getActivity(), getItem(position).id);
}
});
//
//holder.setCheckBox(getItem(position).activated);
//
/**---------------*/
//Red or Blue background
// RelativeLayout settings = (RelativeLayout)convertView.findViewById(R.id.settingsbutton);
holder.setRelativeLayout2((RelativeLayout) convertView.findViewById(R.id.settingsbutton));
//if(getItem(position).activated.equals("false")) {
if (getItem(position).activated.equals("false")) {
holder.getLinearLayout().setBackground(getResources().getDrawable(R.drawable.discrepancy_background_red));
holder.getRelativeLayout().setBackground(getResources().getDrawable(R.drawable.discrepancy_background_red));
holder.getRelativeLayout2().setBackground(getResources().getDrawable(R.drawable.discrepancy_background_red));
}
//holder.setCheckBox(getItem(position).activated);
convertView.setTag(holder);
} else {
convertView.getTag();
}
return convertView;
}
}
public void DialogStop(String title, String message,Context context, final String id){
new AlertDialog.Builder(context)
.setTitle(title)
.setMessage(message)
.setPositiveButton(android.R.string.yes, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
//dialog.cancel();
DeleteTask deleteTask = new DeleteTask();
deleteTask.execute(id);
}
})
.setNegativeButton(android.R.string.no, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
dialog.cancel();
}
})
.setIcon(android.R.drawable.ic_dialog_alert)
.show();
}
private class DeleteTask extends AsyncTask<String, String, String>{
#Override
protected String doInBackground(String... params) {
String response = null;
try {
response = new GlobalConnection().DELETE( getString(R.string.apicdeleteuser) + params[0].toString() );
Log.v("response", response + "");
} catch (Exception e) {
e.printStackTrace();
}
return response;
}
#Override
protected void onPostExecute(String response) {
Log.v("response", response + "");
}
}
private class UsersTask extends AsyncTask<String, Void, ArrayList<Users_mana>> {
#Override
protected ArrayList<Users_mana> doInBackground(String... strings) {
//Users_mana users = null;
String response = null;
ArrayList<Users_mana> users_manas = null;
try{Log.e("start","GET via GlobalConnection()");
response = new GlobalConnection().GET( getString(R.string.apiusers));
users_manas = new Gson().fromJson(response, new TypeToken<ArrayList<Users_mana>>(){}.getType());
Log.e("start","setUsers_mana");
UserManager.getInstance().setUsers_mana(users_manas);
}catch (Exception e){
Log.e("response error", e.getMessage().toString());
}
return users_manas;
}
#Override
protected void onPostExecute(ArrayList<Users_mana> response) {
if(!response.isEmpty()) {Log.e("start","setContent()");
setContent();
StatusManager.getInstance().setUsermStatus(true);
Log.e("UsermStatus:",String.valueOf(StatusManager.getInstance().getUsermStatus()));
}
super.onPostExecute(response);
}
}
private void setContent(){
SampleAdapter adapter = new SampleAdapter(getActivity());
adapter.notifyDataSetChanged();
try {
if (!UserManager.getInstance().getUsers_mana().isEmpty()) {
for (int i = 0; i < UserManager.getInstance().getUsers_mana().size(); i++) {
Log.e("adding to adapter:",UserManager.getInstance().getUsers_mana().get(i).firstName + " " + UserManager.getInstance().getUsers_mana().get(i).lastName + "" + UserManager.getInstance().getUsers_mana().get(i).id + "" + UserManager.getInstance().getUsers_mana().get(i).username + "group:" + UserManager.getInstance().getUsers_mana().get(i).group);
adapter.add(new SampleItem(
UserManager.getInstance().getUsers_mana().get(i).id
, UserManager.getInstance().getUsers_mana().get(i).firstName + " " + UserManager.getInstance().getUsers_mana().get(i).lastName
, UserManager.getInstance().getUsers_mana().get(i).username
, UserManager.getInstance().getUsers_mana().get(i).group
, R.drawable.users_test
, R.drawable.settings
, R.drawable.delete
, UserManager.getInstance().getUsers_mana().get(i).activated
));
}
listView.setAdapter(adapter);Log.e("setting","ListView");
}
}catch (Exception e){
Log.e("error setContent", e.getMessage().toString());
}
}
/*
private class PicturesTask extends AsyncTask<String, String ,String>{
#Override
protected String doInBackground(String... urls) {
//String urldisplay = urls[0];
Bitmap mIcon11 = null;
try {
for(int i = 0; i < urls.length; i++) {
if(UserManager.getInstance().getUsers_mana().get(i).photo != null) {
InputStream in = new java.net.URL(getString(R.string.jetfuel_url ) + UserManager.getInstance().getUsers_mana().get(i).username).openStream();
mIcon11 = BitmapFactory.decodeStream(in);
pictureses.add(new User_pictures(mIcon11, UserManager.getInstance().getUsers_mana().get(i).username, UserManager.getInstance().getUsers_mana().get(i).id));
UserManager.getInstance().setUserPictureses(pictureses);
}
}
} catch (Exception e) {
Log.e("Error", e.getMessage());
e.printStackTrace();
}
return null;
}
#Override
protected void onPostExecute(String s) {
if(!UserManager.getInstance().getUserPictureses().isEmpty()) {
for (int i = 0; i < UserManager.getInstance().getUserPictureses().size(); i++) {
Log.v("pictures", UserManager.getInstance().getUserPictureses().get(i).picture + "");
}
}
super.onPostExecute(s);
}
}
*/
/**---------------------------------------------------------------------------------------------*/
#Override
public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
inflater.inflate(R.menu.main, menu);
//menu.removeItem(R.id.Station);
super.onCreateOptionsMenu(menu, inflater);
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case R.id.Station:
Fragment fragment = new Stations();
FragmentManager fragmentManager = getFragmentManager();
fragmentManager.beginTransaction().replace(R.id.content_frame, fragment).commit();
return true;
default:
return super.onOptionsItemSelected(item);
}
}
/**---------------------------------------------------------------------------------------------*/
}
The xml view:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<LinearLayout
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#color/blue">
<Button
android:id="#+id/addUser_button"
android:layout_width="fill_parent"
android:layout_height="50dp"
android:text="#string/add_user"
android:background="#drawable/button_yellow_background"
android:textStyle="bold"
android:textSize="20sp"
android:textColor="#color/blue"/>
<android.support.v4.widget.SwipeRefreshLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/swipe">
<ListView
android:id="#+id/list"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:background="#color/blue"
/>
</android.support.v4.widget.SwipeRefreshLayout>
</LinearLayout>
</RelativeLayout>
Thank you!
There is a huge problem in your SampleAdapter.getView() method.
When you scroll down the View disappearing at the top of the screen is reused to be injected at the bottom. This reused View is the convertView you get as getView parameter.
As you code is, the reused view is injected with the exact same data (because if (convertView == null) { is always false when you scroll).
Images and texts are not updated.
When you scroll down, the element disappearing at the top just appears at the bottom, and so does others...
You should be doing something like:
public View getView(final int position, View convertView, ViewGroup parent) {
ViewHolder holder;
if (convertView == null) {
convertView = LayoutInflater.from(getContext()).inflate(R.layout.row_usermana, null);
// The ViewHolder constructor should handle the mapping of its views
holder = new ViewHolder(convertView);
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
// Here you should only use holder as in:
holder.userpicture.setImageDrawable(getResources().getDrawable(getItem(position).userPicture));
...
}
This method looks strange, and is perhaps suspect. I don't see getUsers_mana() defined anywhere in this sample code, so I don't know if it is the problem or not. For one, you should call that 'UserManager.getInstance().getUsers_mana()' and then 'get(i)' once each and store the results in variables.
private void setContent(){
SampleAdapter adapter = new SampleAdapter(getActivity());
adapter.notifyDataSetChanged();
try {
if (!UserManager.getInstance().getUsers_mana().isEmpty()) {
for (int i = 0; i < UserManager.getInstance().getUsers_mana().size(); i++) {
Log.e("adding to adapter:",UserManager.getInstance().getUsers_mana().get(i).firstName + " " + UserManager.getInstance().getUsers_mana().get(i).lastName + "" + UserManager.getInstance().getUsers_mana().get(i).id + "" + UserManager.getInstance().getUsers_mana().get(i).username + "group:" + UserManager.getInstance().getUsers_mana().get(i).group);
adapter.add(new SampleItem(
UserManager.getInstance().getUsers_mana().get(i).id
, UserManager.getInstance().getUsers_mana().get(i).firstName + " " + UserManager.getInstance().getUsers_mana().get(i).lastName
, UserManager.getInstance().getUsers_mana().get(i).username
, UserManager.getInstance().getUsers_mana().get(i).group
, R.drawable.users_test
, R.drawable.settings
, R.drawable.delete
, UserManager.getInstance().getUsers_mana().get(i).activated
));
}
listView.setAdapter(adapter);Log.e("setting","ListView");
}
}catch (Exception e){
Log.e("error setContent", e.getMessage().toString());
}
}
It is because you are not doing anything in the
else {
convertView.getTag();
}
Check here
Why we should re-assign values for a recycled convertView in getView()
You have to reassign values to the convertView with the data of the 5th roq, 6th row etc. otherwise it still contains the old data
Remove the initialization of holder on the top and just put this line of code in the beginning of getView function.
ViewHolder holder = null;
You need to re initialize holder if its null and you need to update it with latest data if its not null.
See this sample it might help you
https://github.com/erikwt/PullToRefresh-ListView
I have an app with three fragments which I need to Asynctask every swipe. But it seems that the Asynctask runs only on the opening of the app. But when it's already created, only the first and third fragment functions well when it comes to AsyncTask the second doesn't change when I update the database.
This is my MainActivity.java
package com.example.RadarOperationMonitoringSystem;
import android.app.ActionBar;
import android.app.FragmentTransaction;
import android.os.Bundle;
import android.support.v4.app.FragmentActivity;
import android.support.v4.view.ViewPager;
/**
* Created by Lemueloodle on 2/12/14.
*/
public class MainActivity extends FragmentActivity{
ViewPager Tab;
TabPagerAdapter TabAdapter;
ActionBar actionBar;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
TabAdapter = new TabPagerAdapter(getSupportFragmentManager());
Tab = (ViewPager)findViewById(R.id.viewPager);
Tab.setOnPageChangeListener(
new ViewPager.SimpleOnPageChangeListener() {
#Override
public void onPageSelected(int position) {
actionBar = getActionBar();
actionBar.setSelectedNavigationItem(position); }
});
Tab.setAdapter(TabAdapter);
actionBar = getActionBar();
//Enable Tabs on Action Bar
actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
ActionBar.TabListener tabListener = new ActionBar.TabListener(){
#Override
public void onTabReselected(android.app.ActionBar.Tab tab,
FragmentTransaction ft) {
// TODO Auto-generated method stub
}
#Override
public void onTabSelected(ActionBar.Tab tab, FragmentTransaction ft) {
Tab.setCurrentItem(tab.getPosition());
}
#Override
public void onTabUnselected(android.app.ActionBar.Tab tab,
FragmentTransaction ft) {
// TODO Auto-generated method stub
}};
//Add New Tab
actionBar.addTab(actionBar.newTab().setText("FirstFragment").setTabListener(tabListener));
actionBar.addTab(actionBar.newTab().setText("SecondFragment").setTabListener(tabListener));
actionBar.addTab(actionBar.newTab().setText("ThirdFragment").setTabListener(tabListener));
}
}
This is my TabPagerAdapter
package com.example.RadarOperationMonitoringSystem;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentStatePagerAdapter;
/**
* Created by Lemueloodle on 2/12/14.
*/
public class TabPagerAdapter extends FragmentStatePagerAdapter {
public TabPagerAdapter(FragmentManager fm) {
super(fm);
// TODO Auto-generated constructor stub
}
#Override
public Fragment getItem(int i) {
switch(i) {
case 0:
return new FirstFragment();
case 1:
return new SecondFragment();
case 2:
return new ThirdFragment();
}
return null;
}
#Override
public int getCount() {
// TODO Auto-generated method stub
return 3; //No of Tabs
}
}
This is my FirstFragment.java
package com.example.RadarOperationMonitoringSystem;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
public class FirstFragment extends Fragment {
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View first = inflater.inflate(R.layout.first_frag, container, false);
// get the listview
((TextView)first.findViewById(R.id.textView)).setText("SecondFragment");
return first;
}
}
SecondFragment.java
package com.example.RadarOperationMonitoringSystem;
import android.app.ProgressDialog;
import android.os.AsyncTask;
import android.os.Bundle;
import android.support.v4.app.ListFragment;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ListAdapter;
import android.widget.SimpleAdapter;
import android.widget.TextView;
import org.json.JSONException;
import org.json.JSONObject;
import java.util.ArrayList;
import java.util.HashMap;
public class SecondFragment extends ListFragment {
private ProgressDialog pDialog;
// URL to get contacts JSON
private static final String url = "http://10.0.2.2/radaroperations/networkstatus.php";
private static final String TAG_SITENAME1 = "siteName1";
private static final String TAG_NETSTAT1 = "netlink_stats1";
private static final String TAG_FORECAST1 = "forcasting_stats1";
private static final String TAG_MDSI1 = "pagasa_mdsi_stats1";
private static final String TAG_PNOAH1 = "projectnoah_stats1";
....so on
String site1 = "";
String netstat1 = "";
String forecast1 = "";
String mdsi1 = "";
String pnoah1 = "";
.....so on
ArrayList<HashMap<String, String>> contactList = new ArrayList<HashMap<String, String>>();
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View second = inflater.inflate(R.layout.second_frag, container, false);
((TextView)second.findViewById(R.id.textView)).setText("SecondFragment");
return second;
}
#Override
public void onViewCreated(View view, Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
// We set clear listener
new GetContactsb().execute();
}
public class GetContactsb extends AsyncTask<Void, Void, Void> {
#Override
protected void onPreExecute() {
super.onPreExecute();
// Showing progress dialog
pDialog = new ProgressDialog(getActivity());
pDialog.setMessage("Please wait...");
pDialog.setCancelable(true);
pDialog.show();
}
#Override
public Void doInBackground(Void... arg0) {
// Creating service handler class instance
ServiceHandler2 sh = new ServiceHandler2();
// Making a request to url and getting response
String jsonStr = sh.makeServiceCall(url, ServiceHandler2.GET);
Log.d("Response: ", "> " + jsonStr);
if (jsonStr != null) {
try {
JSONObject c = new JSONObject(jsonStr);
// Getting JSON Array node
site1 = c.getString(TAG_SITENAME1);
netstat1 = c.getString(TAG_NETSTAT1);
forecast1 = c.getString(TAG_FORECAST1);
mdsi1 = c.getString(TAG_MDSI1);
pnoah1 = c.getString(TAG_PNOAH1);
..so on
// tmp hashmap for single contact
HashMap<String, String> contact = new HashMap<String, String>();
// adding each child node to HashMap key => value
contact.put(TAG_SITENAME1, site1);
contact.put(TAG_NETSTAT1, netstat1);
contact.put(TAG_FORECAST1, forecast1);
contact.put(TAG_MDSI1, mdsi1);
contact.put(TAG_PNOAH1, pnoah1);
...so on
// adding contact to contact list
contactList.clear();
contactList.add(contact);
} catch (JSONException e) {
e.printStackTrace();
}
}else {
Log.e("ServiceHandler", "Couldn't get any data from the url");
}
return null;
}
#Override
public void onPostExecute(Void result) {
super.onPostExecute(result);
// Dismiss the progress dialog
if (pDialog.isShowing())
pDialog.dismiss();
/**
*
*/
ListAdapter adapter = new SimpleAdapter(
getActivity(), contactList,
R.layout.list_item2, new String[] { TAG_SITENAME1,TAG_SITENAME2,TAG_SITENAME3,TAG_SITENAME4,
TAG_SITENAME5,TAG_SITENAME6,TAG_SITENAME7},
new int[] { R.id.sitename1, R.id.sitename2, R.id.sitename3, R.id.sitename4,R.id.sitename5,
R.id.sitename6, R.id.sitename7}){
//This will change the color of the value depending on the limit given
public View getView(int position, View convertView, ViewGroup parent) {
View view = super.getView(position, convertView, parent);
TextView netstata = (TextView) view.findViewById(R.id.netstat1);
TextView forecasta = (TextView) view.findViewById(R.id.forecast1);
TextView mdsia = (TextView) view.findViewById(R.id.pmdsi1);
TextView pnoaha = (TextView) view.findViewById(R.id.pnoah1);
....so on
//1 - Red = No link
//2 - Yellow = Delay
//3 - Green = Good
//Radar 1
//Network Link Status
if (netstat1.equals("1")){
netstata.setText("No-Link");
netstata.setTextColor(getResources().getColor(R.color.red));
}
else if(netstat1.equals("2")){
netstata.setText("Delay");
netstata.setTextColor(getResources().getColor(R.color.yellow));
}
else if(netstat1.equals("3")){
netstata.setText("Good");
netstata.setTextColor(getResources().getColor(R.color.green));
}
...so on to Radar 7
return view;
};
};
// updating listviews
setListAdapter(adapter);
}
}
}
ThirdFragment.java
package com.example.RadarOperationMonitoringSystem;
import android.app.ProgressDialog;
import android.os.AsyncTask;
import android.os.Bundle;
import android.support.v4.app.ListFragment;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ListAdapter;
import android.widget.SimpleAdapter;
import android.widget.TextView;
import org.json.JSONException;
import org.json.JSONObject;
import java.util.ArrayList;
import java.util.HashMap;
public class ThirdFragment extends ListFragment {
private ProgressDialog pDialog;
// URL to get contacts JSON
private static final String url = "http://10.0.2.2/radaroperations/energyreadings.php";
private static final String TAG_SITENAME1 = "siteName1";
private static final String TAG_FREQUENCY1 = "Frequency1";
private static final String TAG_ACCURRENT1 = "AC_Voltage1";
private static final String TAG_ACVOLTAGE1 = "AC_Current1";
private static final String TAG_FSTAT1 = "Flimitstat1";
private static final String TAG_VSTAT1 = "Vlimitstat1";
private static final String TAG_CSTAT1 = "Climitstat1";
...so on
// contacts JSONArray
JSONObject c = null;
String site1 = "";
String freq1 = "";
String curr1 = "";
String volts1 = "";
String fstat1 = "";
String vstat1 = "";
String cstat1 = "";
.. so on
ArrayList<HashMap<String, String>> contactList = new ArrayList<HashMap<String, String>>();
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View third = inflater.inflate(R.layout.third_frag, container, false);
((TextView)third.findViewById(R.id.textView)).setText("ThirdFragment");
return third;
}
public void StartProgress() {
new GetContactsc().execute();
}
#Override
public void onViewCreated(View view, Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
// We set clear listener
new GetContactsc().execute();
}
public class GetContactsc extends AsyncTask<Void, Void, Void> {
#Override
protected void onPreExecute() {
super.onPreExecute();
// Showing progress dialog
pDialog = new ProgressDialog(getActivity());
pDialog.setMessage("Please wait...");
pDialog.setCancelable(true);
pDialog.show();
}
#Override
public Void doInBackground(Void... arg0) {
// Creating service handler class instance
ServiceHandler3 sh = new ServiceHandler3();
// Making a request to url and getting response
String jsonStr = sh.makeServiceCall(url, ServiceHandler3.GET);
Log.d("Response: ", "> " + jsonStr);
if (jsonStr != null) {
try {
JSONObject c = new JSONObject(jsonStr);
// Getting JSON Array node
site1 = c.getString(TAG_SITENAME1);
freq1 = c.getString(TAG_FREQUENCY1);
curr1 = c.getString(TAG_ACCURRENT1);
volts1 = c.getString(TAG_ACVOLTAGE1);
fstat1 = c.getString(TAG_FSTAT1);
vstat1 = c.getString(TAG_VSTAT1);
cstat1 = c.getString(TAG_CSTAT1);
...so on
// tmp hashmap for single contact
HashMap<String, String> contact = new HashMap<String, String>();
// adding each child node to HashMap key => value
contact.put(TAG_SITENAME1, site1);
contact.put(TAG_FREQUENCY1, freq1);
contact.put(TAG_ACCURRENT1, curr1);
contact.put(TAG_ACVOLTAGE1, volts1);
contact.put(TAG_FSTAT1, fstat1);
contact.put(TAG_VSTAT1, vstat1);
contact.put(TAG_CSTAT1, cstat1);
...so on
// adding contact to contact list
contactList.clear();
contactList.add(contact);
} catch (JSONException e) {
e.printStackTrace();
}
}else {
Log.e("ServiceHandler", "Couldn't get any data from the url");
}
return null;
}
#Override
public void onPostExecute(Void result) {
super.onPostExecute(result);
// Dismiss the progress dialog
if (pDialog.isShowing())
pDialog.dismiss();
/**
*
*/
ListAdapter adapter = new SimpleAdapter(
getActivity(), contactList,
R.layout.list_item, new String[] { TAG_SITENAME1, TAG_FREQUENCY1, TAG_ACCURRENT1,
TAG_ACVOLTAGE1,TAG_SITENAME2, TAG_FREQUENCY2, TAG_ACCURRENT2,
TAG_ACVOLTAGE2,TAG_SITENAME3, TAG_FREQUENCY3, TAG_ACCURRENT3,
TAG_ACVOLTAGE3, TAG_SITENAME4, TAG_FREQUENCY4, TAG_ACCURRENT4,
TAG_ACVOLTAGE4, TAG_SITENAME5, TAG_FREQUENCY5, TAG_ACCURRENT5,
TAG_ACVOLTAGE5, TAG_SITENAME6, TAG_FREQUENCY6, TAG_ACCURRENT6,
TAG_ACVOLTAGE6, TAG_SITENAME7, TAG_FREQUENCY7, TAG_ACCURRENT7,
TAG_ACVOLTAGE7},
new int[] { R.id.sitename1, R.id.frequency1,
R.id.accurrent1, R.id.acvoltage1, R.id.sitename2, R.id.frequency2,
R.id.accurrent2, R.id.acvoltage2, R.id.sitename3, R.id.frequency3,
R.id.accurrent3, R.id.acvoltage3, R.id.sitename4, R.id.frequency4,
R.id.accurrent4, R.id.acvoltage4, R.id.sitename5, R.id.frequency5,
R.id.accurrent5, R.id.acvoltage5, R.id.sitename6, R.id.frequency6,
R.id.accurrent6, R.id.acvoltage6, R.id.sitename7, R.id.frequency7,
R.id.accurrent7, R.id.acvoltage7}){
//This will change the color of the value depending on the limit given
public View getView(int position, View convertView, ViewGroup parent) {
View view = super.getView(position, convertView, parent);
TextView freqa = (TextView) view.findViewById(R.id.frequency1);
TextView voltsa = (TextView) view.findViewById(R.id.acvoltage1);
TextView curra = (TextView) view.findViewById(R.id.accurrent1);
... so on
//Radar 1
if (fstat1.equals("1")){
freqa.setTextColor(getResources().getColor(R.color.green));
}
else if(fstat1.equals("2")){
freqa.setTextColor(getResources().getColor(R.color.red));
}
if(vstat1.equals("1")){
voltsa.setTextColor(getResources().getColor(R.color.green));
}
else if(vstat1.equals("2")){
voltsa.setTextColor(getResources().getColor(R.color.red));
}
if(cstat1.equals("1")){
curra.setTextColor(getResources().getColor(R.color.green));
}
else if(cstat1.equals("2")){
curra.setTextColor(getResources().getColor(R.color.red));
}
... so on to Radar 7
return view;
};
};
// updating listviews
setListAdapter(adapter);
}
}
}
I had the same problem like u. I think that problem is because ViewPager saves states of last and next pager, and building them before they come. Try setting tab.setOffscreenPageLimit(0). By doing that u may encounter problem that when ever u swipe pages, pages will be rebuild.