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I am new to android and java.Recently I am having problem with displaying fetched json data into listview using baseadapter.
At first I have used this code
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
new TheTask().execute();
}
class TheTask extends AsyncTask<Void,Void,String>
{
#Override
protected String doInBackground(Void... params) {
String str = null;
try
{
HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost("http://10.0.2.2/BSDI/show.php");
HttpResponse response = httpclient.execute(httppost);
str = EntityUtils.toString(response.getEntity());
}
catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return str;
}
#Override
protected void onPostExecute(String result) {
super.onPostExecute(result);
String response = result.toString();
try {
ArrayList<String> stringArray = new ArrayList<String>();
JSONArray new_array = new JSONArray(response);
for(int i = 0, count = new_array.length(); i< count; i++)
{
try {
JSONObject jsonObject = new_array.getJSONObject(i);
stringArray.add(jsonObject.getString("title").toString());
}
catch (JSONException e) {
e.printStackTrace();
}
}
ArrayAdapter<String> adapter = new ArrayAdapter<String> (MainActivity.this,R.layout.test_tuh,stringArray);
ListView list= (ListView) findViewById(R.id.listView1);
list.setAdapter(adapter);
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
//tv.setText("error2");
}
}
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
}
This code displays fetched json data sucessfully. But it only displays only one row. I need more than one (two) rows in listview. So I have tried this code
and it does not work, it shows a blank screen .
My code is below,
class TheTask extends AsyncTask<Void,Void,String>
{
#Override
protected String doInBackground(Void... params) {
String str = null;
try
{
HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost("http://10.0.2.2/BSDI/show.php");
HttpResponse response = httpclient.execute(httppost);
str = EntityUtils.toString(response.getEntity());
}
catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return str;
}
#Override
protected void onPostExecute(String result) {
// TODO Auto-generated method stub
super.onPostExecute(result);
String response = result.toString();
try {
arrayList=new ArrayList<get_set>();
ArrayList<String> stringArray = new ArrayList<String>();
JSONArray new_array = new JSONArray(response);
for(int i = 0, count = new_array.length(); i< count; i++)
{
try {
JSONObject jsonObject = new_array.getJSONObject(i);
stringArray.add(jsonObject.getString("title").toString());
}
catch (JSONException e) {
e.printStackTrace();
}
}
ListView listView;
adap= new BaseAdapter() {
LayoutInflater inflater=(LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
#Override
public View getView(int position, View view, ViewGroup viewgroup) {
if (view==null) {
view=inflater.inflate(R.layout.bsdi, null);
}
TextView title_tuh=(TextView) view.findViewById(R.id.title1);
TextView notice_tuh=(TextView) view.findViewById(R.id.notice1);
title_tuh.setText(arrayList.get(position).getTitle());
notice_tuh=.setText(arrayList.get(position).getNotice());
return view;
}
#Override
public long getItemId(int arg0) {
// TODO Auto-generated method stub
return 0;
}
#Override
public Object getItem(int position) {
// TODO Auto-generated method stub
return arrayList.get(position);
}
#Override
public int getCount() {
// TODO Auto-generated method stub
return arrayList.size();
}
};
listView=(ListView) findViewById(R.id.listView1);
listView.setAdapter(adap);
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
//tv.setText("error2");
}
}
As far I am realizing that , the problem is here
ArrayList<String> stringArray = new ArrayList<String>();
JSONArray new_array = new JSONArray(response);
for(int i = 0, count = new_array.length(); i< count; i++)
{
try {
JSONObject jsonObject = new_array.getJSONObject(i);
stringArray.add(jsonObject.getString("title").toString());
}
catch (JSONException e) {
e.printStackTrace();
}
}
As far I am guesing that extracted json data is storing in stringArray but its not used later. If I try to use it like this , then I get error
title_tuh.setText(stringArray .get(position).getTitle());
notice_tuh=.setText(stringArray .get(position).getNotice());
If I try to not to use
ArrayList stringArray = new ArrayList();
and use
arrayList=new ArrayList(); instead , like this then I also get error.
arrayList=new ArrayList<get_set>();
JSONArray new_array = new JSONArray(response);
//JSONArray jsonArray = new JSONArray();
for(int i = 0, count = new_array.length(); i< count; i++)
{
try {
JSONObject jsonObject = new_array.getJSONObject(i);
arrayList.add(jsonObject.getString("title").toString());
// String in = mInflater.inflate(R.layout.custom_row_view, null);
}
catch (JSONException e) {
e.printStackTrace();
}
}
I can not finding out how to solve this problem.I have seen many online tutorials but those was not helpful for me. Please help me.
First u need t create row_listitem.xml file like:
<?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="80dp"
android:background="#drawable/list_selector"
android:orientation="vertical"
android:padding="5dp" >
<ImageView
android:id="#+id/iv_icon_social"
android:layout_width="60dp"
android:layout_height="60dp"
android:layout_centerVertical="true"
android:background="#drawable/image_border"
android:src="#drawable/sms_t"
android:visibility="gone" />
<LinearLayout
android:id="#+id/thumbnail"
android:layout_width="fill_parent"
android:layout_height="85dp"
android:layout_marginRight="50dp"
android:layout_marginTop="0dp"
android:layout_toRightOf="#+id/iv_icon_social"
android:gravity="center_vertical"
android:orientation="vertical"
android:padding="5dip"
android:visibility="visible" >
<TextView
android:id="#+id/txt_ttlsm_row"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:paddingLeft="10dp"
android:text="Sample text"
android:textSize="18dp"
android:textStyle="bold" />
<TextView
android:id="#+id/txt_ttlcontact_row2"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_marginBottom="0dp"
android:layout_marginTop="3dp"
android:paddingLeft="10dp"
android:maxEms="20"
android:maxLines="2"
android:singleLine="false"
android:ellipsize="end"
android:text="Sample text2"
android:textColor="#808080"
android:textSize="15dp"
android:textStyle="normal"
android:visibility="visible" />
</LinearLayout>
</RelativeLayout>
Now, u need to create Custom BaseAdapter like:
public class BaseAdapter2 extends BaseAdapter {
private Activity activity;
// private ArrayList<HashMap<String, String>> data;
private static ArrayList title,notice;
private static LayoutInflater inflater = null;
public BaseAdapter2(Activity a, ArrayList b, ArrayList bod) {
activity = a;
this.title = b;
this.notice=bod;
inflater = (LayoutInflater) activity
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}
public int getCount() {
return title.size();
}
public Object getItem(int position) {
return position;
}
public long getItemId(int position) {
return position;
}
public View getView(int position, View convertView, ViewGroup parent) {
View vi = convertView;
if (convertView == null)
vi = inflater.inflate(R.layout.row_listitem, null);
TextView title2 = (TextView) vi.findViewById(R.id.txt_ttlsm_row); // title
String song = title.get(position).toString();
title2.setText(song);
TextView title22 = (TextView) vi.findViewById(R.id.txt_ttlcontact_row2); // notice
String song2 = notice.get(position).toString();
title22.setText(song2);
return vi;
}
}
Now, u can set up your main activity like:
public class MainActivity extends Activity {
ArrayList<String> title_array = new ArrayList<String>();
ArrayList<String> notice_array = new ArrayList<String>();
ListView list;
BaseAdapter2 adapter;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
list = (ListView) findViewById(R.id.listView1);
new TheTask().execute();
}
class TheTask extends AsyncTask<Void, Void, String> {
#Override
protected String doInBackground(Void... params) {
String str = null;
try {
HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost(
"http://10.0.2.2/BSDI/show.php");
HttpResponse response = httpclient.execute(httppost);
str = EntityUtils.toString(response.getEntity());
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return str;
}
#Override
protected void onPostExecute(String result) {
super.onPostExecute(result);
String response = result.toString();
try {
JSONArray new_array = new JSONArray(response);
for (int i = 0, count = new_array.length(); i < count; i++) {
try {
JSONObject jsonObject = new_array.getJSONObject(i);
title_array.add(jsonObject.getString("title").toString());
notice_array.add(jsonObject.getString("notice").toString());
} catch (JSONException e) {
e.printStackTrace();
}
}
adapter = new BaseAdapter2(MainActivity.this, title_array, notice_array);
list.setAdapter(adapter);
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
// tv.setText("error2");
}
}
}
}
#Allen Chun , actually its not in my mind currently that what I have changed in my code to run my code perfectly. But I am sharing all my codes which are working perfectly.
Its my layout code,
<?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:id="#+id/fsr"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:text="Notice Board"
android:textSize="20px" />
<TextView
android:id="#+id/err_msg"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text=""
android:gravity="center" />
<ListView
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:id="#+id/list_notice2"
android:layout_gravity="center" />
</LinearLayout>
This is my custom listview layout codes,
<?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:id="#+id/title"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="TextView"
android:paddingTop="10dp"
android:layout_gravity="center"
android:textAppearance="?android:attr/textAppearanceMedium" />
/>
<TextView
android:id="#+id/notice"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Small Text"
android:paddingTop="5dp"
android:layout_gravity="center"
android:textAppearance="?android:attr/textAppearanceSmall" />
</LinearLayout>
its my activity named "NoticeBoard" .
public class NoticeBoard extends Activity {
ArrayList<String> title_array = new ArrayList<String>();
ArrayList<String> notice_array = new ArrayList<String>();
ListView list;
base_adapter3 adapter;
TextView f,msg;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.list_notice);
list = (ListView) findViewById(R.id.list_notice2);
msg=(TextView) findViewById(R.id.err_msg);
new test_ays().execute();
}
class test_ays extends AsyncTask<Void, Void, String> {
#Override
protected String doInBackground(Void... params) {
String str = null ;
try {
HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost("http://10.0.2.2/BSDI/show.php");
HttpResponse response = httpclient.execute(httppost);
str = EntityUtils.toString(response.getEntity());
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return str;
}
#Override
protected void onPostExecute(String result) {
super.onPostExecute(result);
if(result!=null) // add this
{
String response = result.toString();
try {
JSONArray new_array = new JSONArray(response);
for (int i = 0, count = new_array.length(); i < count; i++) {
try {
JSONObject jsonObject = new_array.getJSONObject(i);
title_array.add(jsonObject.getString("title").toString());
notice_array.add(jsonObject.getString("notice").toString());
} catch (JSONException e) {
e.printStackTrace();
}
}
adapter = new base_adapter3(NoticeBoard.this, title_array, notice_array);
list.setAdapter(adapter);
// f=(TextView) findViewById(R.id.textTuh);
// f.setText(title_array);
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
// tv.setText("error2");
}
}
else{
msg.setText("You need a working data connection...");
}
}
}
}
And its my custom baseadapter codes,
public class base_adapter2 extends BaseAdapter {
private Activity activity;
//private ArrayList<HashMap<String, String>> data;
private static ArrayList title,notice;
private static LayoutInflater inflater = null;
public base_adapter2(Activity a, ArrayList b) {
activity = a;
this.title = b;
// this.notice=bod;
inflater = (LayoutInflater) activity
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}
public int getCount() {
return title.size();
}
public Object getItem(int position) {
return position;
}
public long getItemId(int position) {
return position;
}
public View getView(int position, View convertView, ViewGroup parent) {
View vi = convertView;
if (convertView == null)
vi = inflater.inflate(R.layout.bsdi_adapter, null);
TextView title2 = (TextView) vi.findViewById(R.id.txt1); // title
String song = title.get(position).toString();
title2.setText(song);
return vi;
}
}
In this example, I am connecting to Twitters public timeline JSON url.
package net.inchoo.demo.andy1;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;
import java.util.ArrayList;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import android.app.ListActivity;
import android.os.Bundle;
import android.widget.ArrayAdapter;
public class HomeActivity extends ListActivity {
/** Called when the activity is first created. */
#SuppressWarnings({ "rawtypes", "unchecked" })
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
setListAdapter(new ArrayAdapter(this, android.R.layout.simple_list_item_1, this.fetchTwitterPublicTimeline()));
}
public ArrayList<String> fetchTwitterPublicTimeline()
{
ArrayList<String> listItems = new ArrayList<String>();
try {
URL twitter = new URL(
"http://twitter.com/statuses/public_timeline.json");
URLConnection tc = twitter.openConnection();
BufferedReader in = new BufferedReader(new InputStreamReader(
tc.getInputStream()));
String line;
while ((line = in.readLine()) != null) {
JSONArray ja = new JSONArray(line);
for (int i = 0; i < ja.length(); i++) {
JSONObject jo = (JSONObject) ja.get(i);
listItems.add(jo.getString("text"));
}
}
} catch (MalformedURLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return listItems;
}
}
Please direct your attention on the listItems.add(jo.getString(“text”)); line. This is the part that I am grabbing a “text” attribute/property of single JSON object. To get a more “visual” picture of all available attributes/properties you might want to take a look at the XML version of twitters public timeline. This way you will get nice colored XML in your browser, where you can see all available attributes.
Link: http://inchoo.net/dev-talk/android-development/simple-android-json-parsing-example-with-output-into-listactivity/
Json parser:
public class jparser {
static InputStream istream = null;
static JSONObject jObj = null;
//static JSONArray jarray=null;
static String json = "";
//static JSONArray jarray = null;
// constructor
public jparser() {
}
public JSONObject getJFromUrl(String url) {
// Making HTTP request
//try {
// defaultHttpClient
StringBuilder builder = new StringBuilder();
DefaultHttpClient httpClient = new DefaultHttpClient();
HttpPost httpPost = new HttpPost(url);
/*HttpResponse httpResponse = httpClient.execute(httpPost);
HttpEntity httpEntity = httpResponse.getEntity();
istream = httpEntity.getContent();*/
try{
HttpResponse response = httpClient.execute(httpPost);
StatusLine statusLine = response.getStatusLine();
int statusCode = statusLine.getStatusCode();
if (statusCode == 400)
{
HttpEntity entity = response.getEntity();
InputStream content = entity.getContent();
BufferedReader reader = new BufferedReader(new InputStreamReader(content));
String line;
while ((line = reader.readLine()) != null)
{
builder.append(line);
}
}
else
{
Log.e("==>", "Failed to download file");
}
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
try {
BufferedReader reader = new BufferedReader(new InputStreamReader(istream, "iso-8859-1"), 8);
StringBuilder sb = new StringBuilder();
String line = null;
while ((line = reader.readLine()) != null) {
sb.append(line + "\n");
}
istream.close();
json = sb.toString();
} catch (Exception e) {
Log.e("Buffer Error", "Error converting result " + e.toString());
}
// try parse the string to a JSON object
try {
jObj = new JSONObject(json);
} catch (JSONException e) {
Log.e("JSON Parser", "Error parsing data " + e.toString());
}
// return JSON String
return jObj;
// Parse String to JSON object
/*try {
jarray = new JSONArray( builder.toString());
} catch (JSONException e) {
Log.e("JSON Parser", "Error parsing data " + e.toString());
}
// return JSON Object
return jarray;
}*/
}
}
public class JSONParser {
static InputStream is = null;
static JSONObject jObj = null;
static String json = "";
// constructor
public JSONParser() {
}
// function get json from url
// by making HTTP POST or GET mehtod
#SuppressLint("NewApi")
public JSONObject makeHttpRequest(String url, String method,
List<NameValuePair> params) {
// Making HTTP request
try {
StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
StrictMode.setThreadPolicy(policy);
// check for request method
if(method == "POST"){
// request method is POST
// defaultHttpClient
DefaultHttpClient httpClient = new DefaultHttpClient();
HttpPost httpPost = new HttpPost(url);
httpPost.setEntity(new UrlEncodedFormEntity(params));
HttpResponse httpResponse = httpClient.execute(httpPost);
HttpEntity httpEntity = httpResponse.getEntity();
is = httpEntity.getContent();
}else if(method == "GET"){
// request method is GET
DefaultHttpClient httpClient = new DefaultHttpClient();
String paramString = URLEncodedUtils.format(params, "utf-8");
url += "?" + paramString;
HttpGet httpGet = new HttpGet(url);
HttpResponse httpResponse = httpClient.execute(httpGet);
HttpEntity httpEntity = httpResponse.getEntity();
is = httpEntity.getContent();
}
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
try {
BufferedReader reader = new BufferedReader(new InputStreamReader(
is, "iso-8859-1"), 8);
StringBuilder sb = new StringBuilder();
String line = null;
while ((line = reader.readLine()) != null) {
sb.append(line + "\n");
}
is.close();
json = sb.toString();
} catch (Exception e) {
Log.e("Buffer Error", "Error converting result " + e.toString());
}
// try parse the string to a JSON object
try {
jObj = new JSONObject(json);
} catch (JSONException e) {
Log.e("JSON Parser", "Error parsing data " + e.toString());
}
// return JSON String
return jObj;
}
}
<h1>Model</h1>
public class WorkModel {
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getImagename() {
return imagename;
}
public void setImagename(String imagename) {
this.imagename = imagename;
}
String id,name,imagename;
public WorkModel(String s1,String s2,String s3)
{
this.id=s1;
name=s2;
imagename=s3;
}
}
<h1>listview fill</h1>
public class Work_in_process extends Fragment {
//////////////jsonparser implement
JSONParser jsonparser=new JSONParser();
JSONArray json_users=null;
JSONObject json;
/////////
ListView lst;
ArrayList<WorkModel> data=new ArrayList<WorkModel>();
WorkAdapter adapter;
Context con;
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_work_in_process, container, false);
con=this.getActivity();
lst=(ListView)rootView.findViewById(R.id.work_listview);
new work_process().execute();
// Inflate the layout for this fragment
return rootView;
}
class work_process extends AsyncTask<String,String,String>
{
public Dialog pDialog;
#Override
protected void onPreExecute() {
super.onPreExecute();
pDialog = new ProgressDialog(con);
pDialog.setMessage("Loading... Please wait...");
pDialog.setIndeterminate(true);
pDialog.setCancelable(true);
pDialog.show();
}
#Override
protected String doInBackground(String... args) {
data.clear();
List<NameValuePair> params = new ArrayList<NameValuePair>();
json = jsonparser.makeHttpRequest("your url","POST", params);
try {
int success = json.getInt("status");
if (success == 0)
{
return "kbc";
}
else
{
json_users = json.getJSONArray("result");
// looping through All Products
for (int i = 0; i < json_users.length(); i++) {
JSONObject c = json_users.getJSONObject(i);
String t1 = c.getString("id");
String t2 = c.getString("work_title");
String t3 = c.getString("image_path");
WorkModel da=new WorkModel(t1,t2,t3);
data.add(da);
}
return "abc";
}
} catch (JSONException e) {
e.printStackTrace();
}
return null;
}
#Override
protected void onPostExecute(String s) {
super.onPostExecute(s);
pDialog.dismiss();
if(s.equals("abc"))
{
adapter = new WorkAdapter(con, data);
lst.setAdapter(adapter);
adapter.notifyDataSetChanged();
}
else
{
}
}
}
}
<h1>Adapter fill listview</h1>
public class WorkAdapter extends BaseAdapter {
private LayoutInflater inflater1=null;
private static String string=null;
ArrayList<WorkModel> data=null;
Context activity;
DisplayImageOptions options;
protected ImageLoader imageLoader = ImageLoader.getInstance();
public WorkAdapter(Context act,ArrayList<WorkModel> da)
{
activity=act;
data=da;
}
#Override
public int getCount() {
return data.size();
}
#Override
public Object getItem(int position) {
return position;
}
#Override
public long getItemId(int position) {
return position;
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
View vi=convertView;
if(convertView==null)
{
inflater1=(LayoutInflater)parent.getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
vi=inflater1.inflate(R.layout.list_work,null);
}
TextView name;
ImageView img;
name=(TextView)vi.findViewById(R.id.list_work_name);
img= (ImageView)vi.findViewById(R.id.list_work_img);
WorkModel da=new WorkModel(string,string,string);
da=data.get(position);
final String p1,p2,p3;
p1=da.getId();
p2=da.getName();
p3=da.getImagename();
name.setText(p2);
imageLoader.init(ImageLoaderConfiguration.createDefault(activity));
final String imgpath=""+p3;
options = new DisplayImageOptions.Builder()
.showImageOnLoading(R.drawable.wp_loading)
.showImageForEmptyUri(R.drawable.wp_loading)
.showImageOnFail(R.drawable.wp_loading)
.cacheInMemory(true)
.cacheOnDisk(true)
.build();
imageLoader.displayImage(imgpath, img,options);
img.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
DisplayImageOptions options;
final ImageLoader imageLoader = ImageLoader.getInstance();
final Dialog emailDialog =new Dialog(activity, android.R.style.Theme_DeviceDefault);
emailDialog.requestWindowFeature(Window.FEATURE_NO_TITLE);
emailDialog.setCancelable(true);
emailDialog.setContentView(R.layout.zoom_imge);
ImageView image = (ImageView) emailDialog.findViewById(R.id.zoom_image_img);
emailDialog.show();
final String imgpath=""+p3;
options = new DisplayImageOptions.Builder()
.showImageOnLoading(R.drawable.wp_loading)
.showImageForEmptyUri(R.drawable.wp_loading)
.showImageOnFail(R.drawable.wp_loading)
.cacheInMemory(true)
.cacheOnDisk(true)
.build();
imageLoader.displayImage(imgpath, image, options);
}
});
return vi;
}
}
Get schedule
public class GetSchedule extends Activity {
// JSON Node Names
private static final String TAG_SNO = "sno";
private static final String TAG_STNCODE = "stnCode";
private static final String TAG_STATION = "station";
// private static final String TAG_ROUTENO= "routeNo";
private static final String TAG_ARRIVALTIME = "arrivalTime";
private static final String TAG_DEPTIME = "depTime";
private JSONArray station = null;
private ListView list;
//private static String url = "http://railpnrapi.com/api/route/train/";
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_get_schedule);
try {
ArrayList<HashMap<String, String>> stnNamelist = new ArrayList<HashMap<String, String>>();
// Getting JSON Array
// JSONObject job = new JSONObject();
//JSONArray jArray = ModuleClass.trainScheduleJSONObject.getJSONArray("stnName");
JSONObject json_data = null;
station= ModuleClass.trainScheduleJSONObject.getJSONArray(TAG_STATION);
for (int i = 0; i < station.length(); i++) {
json_data = station.getJSONObject(i);
// JSONObject c = stnName.getJSONObject(0);
// Storing JSON item in a Variable
String sno = json_data.getString(TAG_SNO);
String stnCode = json_data.getString(TAG_STNCODE);
// String distance= c.getString(TAG_DISTANCE);
// String routeNo = c.getString(TAG_ROUTENO);
String arrivalTime = json_data.getString(TAG_ARRIVALTIME);
String depTime = json_data.getString(TAG_DEPTIME);
// String haltTime = c.getString(TAG_HALTTIME);
// String tday= c.getString(TAG_TDAY);
// String remark = c.getString(TAG_REMARK);
// Adding value HashMap key => value
stnNamelist = new ArrayList<HashMap<String, String>>();
HashMap<String, String> map = new HashMap<String, String>();
map.put(TAG_SNO, sno);
map.put(TAG_STNCODE, stnCode);
map.put(TAG_DEPTIME, depTime);
map.put(TAG_ARRIVALTIME, arrivalTime);
// map.put(TAG_DEPTIME,depTime );
stnNamelist.add(map);
list = (ListView) findViewById(R.id.listView1);
final SimpleAdapter sd;
sd = new SimpleAdapter(this, stnNamelist, R.layout.activity_get_schedule,
new String[] { TAG_SNO, TAG_STNCODE, TAG_ARRIVALTIME, TAG_DEPTIME },
new int[] { R.id.textView1, R.id.textView2, R.id.textView3, R.id.textView4});
list.setAdapter(sd);
/*
* list.setOnItemClickListener(new
* AdapterView.OnItemClickListener() {
*
* #Override public void onItemClick(AdapterView<?> parent, View
* view, int position, long id) { Toast.makeText(
* MainActivity.this, "You Clicked at " +
* stnNamelist.get(+position).get( "name"), Toast.LENGTH_SHORT)
* .show(); } });
*/
}
// Set JSON Data in TextView
// uid.setText(id);
// name1.setText(name);
// email1.setText(email);
} 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.get_schedule, menu);
return true;
}
}
ListView from JSON data fetched using Retrofit2 service
JSON response
{
"results": [
{
"phone": "+9178XXXX66",
"name": "Olivia"
},
{
"phone": "+9178XXXX66",
"name": "Isla"
},
{
"phone": "+9178XXXX66",
"name": "Emily"
},
{
"phone": "+9178XXXX66",
"name": "Amelia"
},
{
"phone": "+9178XXXX66",
"name": "Sophia"
}],
"statusCode": "1",
"count": "2"
}
In MainActivity.java we will pass JSON data as ArrayList(dummyData)
customListAdapter = new CustomListAdapter(getApplicationContext(), dummyData);
listView = (ListView) findViewById(R.id.listShowJSONData);
listView.setAdapter(customListAdapter);
In custom BaseAdapter our
...
...
#Override
public MyModel getItem(int i) {
return this.users.get(i);
}
#Override
public long getItemId(int i) {
return i;
}
#Override
public View getView(final int i, View view, ViewGroup viewGroup) {
if(view==null)
{
view= LayoutInflater.from(c).inflate(R.layout.json_data_list,viewGroup,false);
}
TextView mUserDetails = (TextView) view.findViewById(R.id.userDetails);
TextView mUserStatus = (TextView) view.findViewById(R.id.userStatus);
Object getrow = this.users.get(i);
LinkedTreeMap<Object,Object> rowmap = (LinkedTreeMap) getrow;
String name = rowmap.get("name").toString();
String phone = rowmap.get("phone").toString();
mUserDetails.setText(name);
mUserStatus.setText(phone);
return view;
}
...
...
Here MyModel will be used as custom mapping model of response we will get from service
See link for complete code explanation
I have two fragments in site my first fragment call AsyncTask and get some json values.and then i want to pass my JSON values to my second Fragment's TextViews.What is the best way pass json value between fragments?
this is my AsyncTask in Fragment 1
class LoadingAccountEntry extends AsyncTask<String, String, String> {
#Override
protected void onPreExecute() {
}
#Override
protected String doInBackground(String... args) {
String response;
Map<String, Object> data = new LinkedHashMap<String, Object>();
data.put(SESSION, sessionId);
data.put(MODULE_NAME, module_name);
data.put(ID, entry_id != null ? entry_id : "");
data.put(
SELECT_FIELDS,
(selectFields != null && selectFields.length != 0) ? new JSONArray(
Arrays.asList(selectFields)) : "");
try {
JSONArray nameValueArray = new JSONArray();
if (linkNameToFieldsArray != null
&& linkNameToFieldsArray.size() != 0) {
for (Entry<String, List<String>> entry : linkNameToFieldsArray
.entrySet()) {
JSONObject nameValue = new JSONObject();
nameValue.put("name", entry.getKey());
nameValue.put("value", new JSONArray(entry.getValue()));
nameValueArray.put(nameValue);
}
}
data.put(LINK_NAME_TO_FIELDS_ARRAY, nameValueArray);
String restData = org.json.simple.JSONValue.toJSONString(data);
HttpClient httpClient = new DefaultHttpClient();
HttpPost req = new HttpPost(restURL);
// Add your data
List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>();
nameValuePairs.add(new BasicNameValuePair(METHOD, GET_ENTRY));
nameValuePairs.add(new BasicNameValuePair(INPUT_TYPE, JSON));
nameValuePairs.add(new BasicNameValuePair(RESPONSE_TYPE, JSON));
nameValuePairs.add(new BasicNameValuePair(REST_DATA, restData));
req.setEntity(new UrlEncodedFormEntity(nameValuePairs));
// Send POST request
httpClient.getParams().setBooleanParameter(
CoreProtocolPNames.USE_EXPECT_CONTINUE, false);
HttpResponse res = httpClient.execute(req);
response = EntityUtils.toString(res.getEntity());
// Log.d("Responce", response.toString());
if (response == null) {
Log.e("Error !", "faild to connect !");
}
JSONObject responseObj = new JSONObject(response);
JSONArray jArray = responseObj.getJSONArray(ENTRY_LIST);
for (int i = 0; i < jArray.length(); i++) {
JSONObject obj = jArray.getJSONObject(i);
// Log.d("obj", obj.toString());
// JSONObject objName = new JSONObject("name");
id = obj.getString("id");
Log.d("id", id);
JSONObject name_value_list = obj
.getJSONObject("name_value_list");
JSONObject assignedUserName = name_value_list
.getJSONObject("assigned_user_name");
assigned_user_name = assignedUserName.getString("value");
Log.d("assigned_user_name", assigned_user_name);
JSONObject modifiedByName = name_value_list
.getJSONObject("modified_by_name");
modified_by_name = modifiedByName.getString("value");
Log.d("modified_by_name", modified_by_name);
}
} catch (JSONException e) {
} catch (UnsupportedEncodingException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (ClientProtocolException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return null;
}
#Override
protected void onPostExecute(String result) {
}
This Fragment 2
public class Fragment_account_details extends Fragment {
TextView name, officePhone,fax;
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_account_details, container,false);
name = (TextView) rootView.findViewById(R.id.text_name);
fax = (TextView) rootView.findViewById(R.id.text_fax);
return rootView;
}
You can use bundle to pass data to Fragment_account_details like this :
Fragment fragment = new Fragment_account_details();
Bundle bundle = new Bundle();
bundle.putString("name", name);
fragment.setArguments(bundle);
now in your Fragment_account_details onCreateView do like :
String name= getArguments().getString("name");
like this you can pass values.hope this helps.
I want to get data from php, then show in listview. But I do not know not to tell the listview update the data I have got for php. I have try to use notifyDataSetChanged();, but I do know where should it put.
public class List_View extends ListFragment{
private String result;
private ListView listView;
private ArrayList<String> items = new ArrayList<String>();
final String uri = "http://localhost/userinfo.php";
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState){
View rootView = inflater.inflate(R.layout.list, container, false);
setListAdapter(new ArrayAdapter<String>(getActivity(), android.R.layout.simple_list_item_1, items));
return rootView;
}
class sendPostRunnable implements Runnable{
#Override
public void run(){
result = sendPostDataToInternet();
String temp = "Not result.";
try {
JSONTokener jsonTokener = new JSONTokener(result);
JSONObject jsonObject = (JSONObject) jsonTokener.nextValue();
JSONArray jarray = jsonObject.getJSONArray("response");
for (int i = 0; i < jarray.length(); i++) {
temp = "";
JSONObject jobject = jarray.getJSONObject(i);
temp += "name: "+jobject.getString("name")+"\n";
temp += "email: "+jobject.getString("email");
items.add(temp);
temp = "";
}
if(jarray.length() < 1){
items.add(temp);
}
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
private String sendPostDataToInternet(){
HttpPost httpRequest = new HttpPost(uri);
List<NameValuePair> params = new ArrayList<NameValuePair>();
params.add(new BasicNameValuePair("uid", "u1"));
try{
httpRequest.setEntity(new UrlEncodedFormEntity(params, HTTP.UTF_8));
HttpResponse httpResponse = new DefaultHttpClient().execute(httpRequest);
if (httpResponse.getStatusLine().getStatusCode() == 200){
String strResult = EntityUtils.toString(httpResponse.getEntity());
return strResult;
}
} catch (Exception e){
e.printStackTrace();
}
return null;
}
}
You should collect all arrived data in other collection (other than used in list adapter) in separate thread and then replace the list colletion source and right after than you should call notifyDataSetChanged().
public class List_View extends ListFragment{
private String result;
private ListView listView;
protected List newData;
protected ArrayAdapter listAdapter;
private ArrayList<String> items = new ArrayList<String>();
final String uri = "http://localhost/userinfo.php";
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState){
View rootView = inflater.inflate(R.layout.list, container, false);
listAdapter = new ArrayAdapter<String>(getActivity(), android.R.layout.simple_list_item_1, items);
setListAdapter(listAdapter );
return rootView;
}
class sendPostRunnable implements Runnable{
#Override
public void run(){
result = sendPostDataToInternet();
String temp = "Not result.";
// a new collection to fill from response
newData = new ArrayList<String>();
try {
JSONTokener jsonTokener = new JSONTokener(result);
JSONObject jsonObject = (JSONObject) jsonTokener.nextValue();
JSONArray jarray = jsonObject.getJSONArray("response");
for (int i = 0; i < jarray.length(); i++) {
temp = "";
JSONObject jobject = jarray.getJSONObject(i);
temp += "name: "+jobject.getString("name")+"\n";
temp += "email: "+jobject.getString("email");
//here you should create a corresponding object from JSON
// and add it to newData List
newData .add(temp);
temp = "";
}
if(jarray.length() < 1){
items.add(temp);
}
// here you will have a newData List filled so you should
// replace or add data from this List to ListView's used
items.add(newData);
listAdapter.notifyDataSetChanged();
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
private String sendPostDataToInternet(){
HttpPost httpRequest = new HttpPost(uri);
List<NameValuePair> params = new ArrayList<NameValuePair>();
params.add(new BasicNameValuePair("uid", "u1"));
try{
httpRequest.setEntity(new UrlEncodedFormEntity(params, HTTP.UTF_8));
HttpResponse httpResponse = new DefaultHttpClient().execute(httpRequest);
if (httpResponse.getStatusLine().getStatusCode() == 200){
String strResult = EntityUtils.toString(httpResponse.getEntity());
return strResult;
}
} catch (Exception e){
e.printStackTrace();
}
return null;
}
}
im trying to get some information from a site BayFiles.net using their API.
The call URL is: http://api.bayfiles.net/v1/account/files?session=SESSION-ID
The error i get is:
07-04 13:54:39.525: E/log_tag(588): Error parsing data org.json.JSONException: Value at error of type java.lang.String cannot be converted to JSONArray
The JSON output when correct sessionID is something like this:
{
"error": "",
"S8tf": {
"infoToken": "wCfhXe",
"deleteToken": "gzHTfGcF",
"size": 122484,
"sha1": "8c4e2bbc0794d2bd4f901a36627e555c068a94e6",
"filename": "Screen_Shot_2013-07-02_at_3.52.23_PM.png"
},
"S29N": {
"infoToken": "joRm6p",
"deleteToken": "IL5STLhq",
"size": 129332,
"sha1": "b4a03897121d0320b82059c36f7a10a8ef4c113d",
"filename": "Stockholmsyndromet.docx"
}
}
however i cant get to catch the respons and show it in a listview.
This is my activity:
public class FilesActivity extends SherlockListActivity implements
OnClickListener {
private ProgressDialog mDialog;
ActionBar ABS;
TextView session;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.dblist);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
getSupportActionBar().setTitle("Files");
JsonAsync asyncTask = new JsonAsync();
// Using an anonymous interface to listen for objects when task
// completes.
asyncTask.setJsonListener(new JsonListener() {
#Override
public void onObjectReturn(JSONObject object) {
handleJsonObject(object);
}
});
// Show progress loader while accessing network, and start async task.
mDialog = ProgressDialog.show(this, getSupportActionBar().getTitle(),
getString(R.string.loading), true);
asyncTask.execute("http://api.bayfiles.net/v1/account/files?session=" + PreferenceManager.getDefaultSharedPreferences(getBaseContext()).getString("sessionID", "defaultStringIfNothingFound"));
//session = (TextView)findViewById(R.id.textView1);
//session.setText(PreferenceManager.getDefaultSharedPreferences(getBaseContext()).getString("sessionID", "defaultStringIfNothingFound"));
}
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
}
private void handleJsonObject(JSONObject object) {
ArrayList<HashMap<String, String>> mylist = new ArrayList<HashMap<String, String>>();
try {
JSONArray shows = object.getJSONArray("error");
for (int i = 0; i < shows.length(); i++) {
HashMap<String, String> map = new HashMap<String, String>();
JSONObject e = shows.getJSONObject(i);
//map.put("video_location", "" + e.getString("video_location"));
mylist.add(map);
}
} catch (JSONException e) {
Log.e("log_tag", "Error parsing data " + e.toString());
}
ListAdapter adapter = new SimpleAdapter(this, mylist, R.layout.dbitems,
new String[] { "video_title", "video_location" }, new int[] { R.id.item_title,
R.id.item_subtitle });
setListAdapter(adapter);
final ListView lv = getListView();
lv.setTextFilterEnabled(true);
lv.setOnItemClickListener(new OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
#SuppressWarnings("unchecked")
HashMap<String, String> o = (HashMap<String, String>) lv
.getItemAtPosition(position);
//Intent myIntent = new Intent(ListShowsController.this,
// TestVideoController.class);
//myIntent.putExtra("video_title", o.get("video_title"));
//myIntent.putExtra("video_channel", o.get("video_channel"));
//myIntent.putExtra("video_location", o.get("video_location"));
//startActivity(myIntent);
}
});
if (mDialog != null && mDialog.isShowing()) {
mDialog.dismiss();
}
}
}
and my JSONfunctions:
public class JSONfunctions {
public static JSONObject getJSONfromURL(String url){
InputStream is = null;
String result = "";
JSONObject jArray = null;
//http post
try{
HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost(url);
try {
// Add your data
/*List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(2);
nameValuePairs.add(new BasicNameValuePair("key", "stianxxs"));
nameValuePairs.add(new BasicNameValuePair("secret", "mhfgpammv9f94ddayh8GSweji"));
httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs)); */
// Execute HTTP Post Request
HttpResponse response = httpclient.execute(httppost);
//HttpResponse response = httpclient.execute(httppost);
HttpEntity httpEntity = response.getEntity();
is = httpEntity.getContent();
} catch (ClientProtocolException e) {
// TODO Auto-generated catch block
} catch (IOException e) {
// TODO Auto-generated catch block
}
}catch(Exception e){
Log.e("log_tag", "Error in http connection "+e.toString());
}
//convert response to string
try{
BufferedReader reader = new BufferedReader(new InputStreamReader(is,"iso-8859-1"),8);
StringBuilder sb = new StringBuilder();
String line = null;
while ((line = reader.readLine()) != null) {
sb.append(line + "\n");
}
is.close();
result=sb.toString();
}catch(Exception e){
Log.e("log_tag", "Error converting result "+e.toString());
}
try{
jArray = new JSONObject(result);
}catch(JSONException e){
Log.e("log_tag", "Error parsing data "+e.toString());
}
return jArray;
}
}
Any help is much appreciated!
As 'error' is not JSONArray it is giving you parsing error.
JSONArray shows = object.getJSONArray("error");
Change you line to
String shows = object.getString("error");
You can refer to these link for JSON Parsing.
https://stackoverflow.com/a/16938507/1441666
I have read plenty of examples ,but if I wish to maintain my scroll position after a ListView is updated from JSON ,then can I do that without using an AsyncTask instance ???
the code for my list is
String wrd;
//ArrayList<HashMap<String,String>> mylist;
#Override
public void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
Intent i2=getIntent();
wrd=i2.getStringExtra("entrd");
Log.v("keyis",wrd);
final Handler handler = new Handler();
Runnable runable = new Runnable() {
#Override
public void run() {
//call the function
LoadData();
//also call the same runnable
handler.postDelayed(this, 40000);
}
};
handler.postDelayed(runable, 10);
}public void LoadData(){
JSONObject j2=JSONfunctions.getJSONfromURL("/webservice_search.php?keyword="+wrd+"&format=json");
ArrayList<HashMap<String,String>> mylist = new ArrayList<HashMap<String,String>>();
try{JSONArray jray=j2.getJSONArray("listings");
for(int i=0;i<jray.length();i++){
Log.v("state","json data being read");
JSONObject j3= jray.getJSONObject(i);
String first=j3.getString("listing");
Log.v("sublist", first);
JSONObject j4=j3.getJSONObject("listing");
String sec=j4.getString("links");
int maxLength = (sec.length() < 30)?sec.length():27;
sec.substring(0, maxLength);
String cutsec=sec.substring(0,maxLength);
Log.v("links are",cutsec);
String img=j4.getString("image_name");
Log.v("image name is ",img);
//Uri dimg=Uri.parse("http://zeesms.info/android_app_images/Koala.jpg");
HashMap<String,String> map=new HashMap<String,String>();
map.put("Id",String.valueOf(i));
map.put(Li_nk,cutsec);
map.put(Image_name,j4.getString("image_name"));
map.put(KEY_THUMB_URL,"http://zeesms.info/android_app_images/"+img);
mylist.add(map);
}
}
catch(JSONException e){
Log.e("loG_tag","Error parsing"+e.toString());
}
LazyAdapter adapter = new LazyAdapter(this,mylist);
adapter.notifyDataSetChanged();
ListView list=(ListView)findViewById(R.id.lv1);
list.setEmptyView(findViewById(R.id.empty));
list.setAdapter(adapter);
list.setItemsCanFocus(false);
and my adapter is
public class LazyAdapter extends BaseAdapter {
private Activity activity;
private ArrayList<HashMap<String, String>> data;
private static LayoutInflater inflater=null;
public ImageLoader imageLoader;
public LazyAdapter(Activity a, ArrayList<HashMap<String, String>> d) {
activity = a;
data=d;
inflater = (LayoutInflater)activity.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
imageLoader=new ImageLoader(activity.getApplicationContext());
}
#Override
public int getCount() {
// TODO Auto-generated method stub
return data.size();
}
#Override
public Object getItem(int position) {
// TODO Auto-generated method stub
return position;
}
#Override
public long getItemId(int position) {
// TODO Auto-generated method stub
return position;
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
View vi=convertView;
if(convertView==null)
vi = inflater.inflate(R.layout.custom_row_view1, null);
TextView title = (TextView)vi.findViewById(R.id.linkname); // merchnts name
TextView artist = (TextView)vi.findViewById(R.id.imagename); // address
//TextView duration = (TextView)vi.findViewById(R.id); // distance
ImageView thumb_image=(ImageView)vi.findViewById(R.id.mClogo); // logo
HashMap<String, String> jsn = new HashMap<String, String>();
jsn = data.get(position);
// Setting all values in listview
title.setText(jsn.get(Second.Li_nk));
artist.setText(jsn.get(Second.Image_name));
//duration.setText(song.get(CustomizedListView.KEY_DURATION));
imageLoader.DisplayImage(jsn.get(Second.KEY_THUMB_URL), thumb_image);
return vi;
}
and finally the class being used for json parsing is
public class JSONfunctions {
public static JSONObject getJSONfromURL(String url){
InputStream is = null;
String result = "";
JSONObject jArray = null;
String str1="http://zeesms.info"+url;
// ArrayList<NameValuePair> namevaluepairs = new ArrayList<NameValuePair>();
Log.v("url result",url);
//namevaluepairs.add(new BasicNameValuePair("location",str1));
//http post
try{
HttpClient httpclient= new DefaultHttpClient();
HttpGet request = new HttpGet();
request.setURI(new URI(str1));
HttpResponse response = httpclient.execute(request);
is = response.getEntity().getContent();
if(is==null){
Log.v("url result","is null");
}
else
{
Log.v("url result","is not null");
}
/* BufferedReader buf = new BufferedReader(new InputStreamReader(is,"UTF-8"));
StringBuilder sb = new StringBuilder();
String s;
while(true )
{
s = buf.readLine();
if(s==null || s.length()==0)
break;
sb.append(s);
}
buf.close();
is.close();
sb.toString(); */
// httppost.setEntity(new UrlEncodedFormEntity(namevaluepairs));
//HttpResponse response=httpclient.execute(httppost);
//HttpEntity entity=response.getEntity();
//is=entity.getContent();
/*
HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost(url);
HttpResponse response = httpclient.execute(httppost);
HttpEntity entity = response.getEntity();
is = entity.getContent();
*/
}catch(Exception e){
Log.v("log_tag", "Error in http connection "+e.toString());
AlertDialog.Builder alert=new AlertDialog.Builder(null);
alert.setMessage("Invalid Keyword").setPositiveButton("Ok", new OnClickListener(){
#Override
public void onClick(DialogInterface arg0, int arg1) {
// TODO Auto-generated method stub
}
});
}
//convert response to string
try{
Log.v("url result","getting result starts");
BufferedReader reader = new BufferedReader(new InputStreamReader(is,"iso-8859-1"),8);
StringBuilder sb = new StringBuilder();
String line = null;
Log.v("url result","getting result");
while ((line = reader.readLine()) != null) {
Log.v("url result","getting result");
sb.append(line + "\n");
}
is.close();
result=sb.toString();
Log.v("url result",result);
}catch(Exception e){
Log.e("log_tag", "Error converting result "+e.toString());
}
try{
jArray = new JSONObject(result);
}catch(JSONException e){
Log.e("log_tag", "Error parsing data "+e.toString());
}
return jArray;
}
}
along with this if the data is updated from the webpage, what would be the simplest way to show the updated item on top ??
It is easier to maintain scroll position by calling notifydatasetchanged() only. The problem there is that you are creating a new adapter every time the data gets updated... you should do something like this:
if(listView.getAdapter()==null)
listView.setAdapter(myAdapter);
else{
myAdapter.updateData(myNewData); //update adapter's data
myAdapter.notifyDataSetChanged(); //notifies any View reflecting data to refresh
}
This way, your listview will mantain the scrolling position.
In case you want to scroll to a new position, use:
list.smoothScrollToPosition(int position);
In case for some reason you don't want to call notifyDataSetChanged(), the you can maintain the position by using setSelectionFromTop()
Before updating the adaptor:
lastViewedPosition = listView.getFirstVisiblePosition();
//get offset of first visible view
View v = listView.getChildAt(0);
topOffset = (v == null) ? 0 : v.getTop();
After updating the adaptor:
listView.setSelectionFromTop(lastViewedPosition, topOffset);
list.smoothScrollToPosition(int position); //my favorite :)
It may also help you to scroll nice'n'smooth to a particular item
listview.setSelection( i );
this will help you to set particular row at top
For overall picture:
In your API response callback, call this function(example) below:
MyAdapter mAdapter;
ArrayList<Users> mUsers;
private void updateListView(ArrayList<Users> users) {
mUsers.addAll(users);
if(mAdapter == null) {
mAdapter = new MyAdapter(getContext(), mUsers);
mListView.setAdapter(mAdapter);
}
mAdapter.notifyDataSetChanged(); // Add this one
}
If you're using an ArrayAdapter (or a subclass of it), the problem may be caused by that the adapter updates the list when you clean it before adding the new items:
adapter.clear();
adapter.addAll(...);
You can fix it by wrapping the code that modifies the adapter like this:
adapter.setNotifyOnChange(false); // Disable calling notifyDatasetChanged() on modification
adapter.clear();
adapter.addAll(...); // Notify the adapter about that data has changed. Note: it will re-enable notifyOnChange
adapter.notifyDataSetChanged();