Solve startActivity in fragment

Solve startActivity in fragment - android

I have a problem in my code. My problem is related to the startActivity(). When the app is running on the emulator, it does not work. The line causing the problem is described in the end.
I tried to open a new activity (this, newactivity.class), however the problem persists.
UpdateAnsList
public class UpdateAnsList extends Fragment{
/**
* #param args
*/
final static String ARG_POSITION_ANSWER = "position";
private String jsonResult;
private ListView listView;
public int selsub;
public Activity activity;
public String tagsub;
private Context mContext;
private Activity mact;
public UpdateAnsList(Activity _activity){
mact = _activity;
this.activity = _activity;
super.onAttach(_activity);
mContext = this.activity.getApplicationContext();
}
public enum SubSectionAnswer {
TagArt,
TagBio
}
public void StartUpdateAnsList(int v, String o){
tagsub = o;
selsub = v;
SubSectionAnswer currentSub = SubSectionAnswer.valueOf(tagsub);
listView = (ListView) this.activity.findViewById(R.id.listView11);
selectItemAns(selsub,currentSub);
accessWebService();
}
private void selectItemAns(int position, SubSectionAnswer currentSub) {
switch(currentSub){
case TagArt:
switch(position){
case R.id.buttonArt001:
url = "myip/newfolder/question_2.php";
tagdb = "info_general";
break;
case R.id.buttonArt002:
url = "http://myip/newfolder/question_1.php";
tagdb = "info_animation";
break;
case 2:
break;
}
break;
case TagBio:
switch(position){
case R.id.ButtonBio001:
url = "http://myip/newfolder/question_4.php";
tagdb = "info_general";
break;
case R.id.buttonBio002:
url = "http://myip/newfolder/question_5.php";
tagdb = "info_evolution";
break;
case 2:
break;
}
break;
}
}
// Async Task to access the web
private class JsonReadTask extends AsyncTask<String, Void, String> {
#Override
protected String doInBackground(String... params) {
HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost(params[0]);
try {
HttpResponse response = httpclient.execute(httppost);
jsonResult = inputStreamToString(
response.getEntity().getContent()).toString();
}
catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
private StringBuilder inputStreamToString(InputStream is) {
String rLine = "";
StringBuilder answer = new StringBuilder();
BufferedReader rd = new BufferedReader(new InputStreamReader(is));
try {
while ((rLine = rd.readLine()) != null) {
answer.append(rLine);
}
}
catch (IOException e) {
// e.printStackTrace();
//Toast.makeText(getApplicationContext(),
// "Error..." + e.toString(), Toast.LENGTH_LONG).show();
}
return answer;
}
#Override
protected void onPostExecute(String result) {
ListDrwaer();
}
}// end async task
public void accessWebService() {
JsonReadTask task = new JsonReadTask();
// passes values for the urls string array
task.execute(new String[] { url });
}
// build hash set for list view
public void ListDrwaer() {
List<Map<String, String>> employeeList = new ArrayList<Map<String, String>>();
try {
JSONObject jsonResponse = new JSONObject(jsonResult);
JSONArray jsonMainNode = jsonResponse.optJSONArray(tagdb);
for (int i = 0; i < jsonMainNode.length(); i++) {
JSONObject jsonChildNode = jsonMainNode.getJSONObject(i);
String name = jsonChildNode.optString("employee name");
String number = jsonChildNode.optString("content_text");
//String outPut = name + "-" + number;
String outPut = name;
String outPut1 = number;
employeeList.add(createEmployee("Question", outPut,"textlong",number));
}
} catch (JSONException e) {
Toast.makeText(this.activity, "Error" + e.toString(),
Toast.LENGTH_SHORT).show();
}
//new String[] { "employees" }
//new int[] { android.R.id.text1 }
String[] de = {"Question", "textlong"};
int[] para ={R.id.textView1list11, R.id.textView11 };
SimpleAdapter simpleAdapter = new SimpleAdapter(this.activity, employeeList,
R.layout.activity_item_list_answer,
de, para);
listView.setAdapter(simpleAdapter);
listView.setOnItemClickListener(new ListClickHandler());
//Toast.makeText(getApplication(), "c", Toast.LENGTH_SHORT).show();
}
public class ListClickHandler implements OnItemClickListener{
public void onItemClick(AdapterView<?> adapter, View view, int position, long arg3) {
// TODO Auto-generated method stub
int a =1 ;
//Toast.makeText(mContext, "c", Toast.LENGTH_SHORT).show();
//Intent i = new Intent(mact, QuestionActivity.class);
//mContext.startActivity(i);
// create intent to perform web search for this planet
Intent intent = new Intent(Intent.ACTION_WEB_SEARCH);
intent.putExtra(SearchManager.QUERY, "test");
// catch event that there's no activity to handle intent
mContext.startActivity(intent);
}
}
private HashMap<String, String> createEmployee(String s1, String s2, String s3,String s4) {
HashMap<String, String> employeeNameNo = new HashMap<String, String>();
employeeNameNo.put(s1, s2);
employeeNameNo.put(s3, s4);
return employeeNameNo;
}
}
This is the line causing the problem:
mContext.startActivity(intent);
Screen of debug:
Screen when I use getActivity():

You should start new Activity using Activity context:
getActivity.startActivity(intent);

This is a Fragment class, so you are not able to pass an Intentby simply writing this.startActivity();
What you need to do is to get the Activity of this Fragment class.
So instead of mContext.startActivity(intent); you should write :
getActivity().startActivity(intent);

Basically you are working with Fragment:
How to Start Activity from Fragment:
mContext.startActivity(intent);
Edit 1:
private Context mContext;
public void StartUpdateAnsList(Context ctx, int v, String o){
mContext = ctx;
tagsub = o;
selsub = v;
SubSectionAnswer currentSub = SubSectionAnswer.valueOf(tagsub);
listView = (ListView) this.activity.findViewById(R.id.listView11);
selectItemAns(selsub,currentSub);
accessWebService();
}
Now you can use: mContext.startActivity(intent);
Hope this will help you.

Related

Unable to parse JSON data into Listview

im trying to parse data from SQL Database into Listview.
My PHP script is working because if i run it in the browser i get the content.
If im trying to get the data from my SQL Databse into the listview my app shows nothing.
Here is my MainActivity:
public class Locations extends AppCompatActivity implements AdapterView.OnItemClickListener {
ArrayList<productforloc> arrayList;
ListView lv;
private String TAG = Locations.class.getSimpleName();
private TextView addressField; //Add a new TextView to your activity_main to display the address
private LocationManager locationManager;
private String provider;
int i = 1;
private ProgressDialog pDialog;
String name;
// URL to get contacts JSON
private static String url = "Mylink";
ArrayList<HashMap<String, String>> contactList;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.content_main);
Intent i = getIntent();
String cityname = i.getExtras().getString("cityname");
TextView city = (TextView) findViewById(R.id.ort);
city.setText(cityname);
pDialog = new ProgressDialog(Locations.this);
pDialog.setMessage("Please wait...");
pDialog.setCancelable(true);
pDialog.show();
arrayList = new ArrayList<>();
lv = (ListView) findViewById(R.id.lv);
lv.setOnItemClickListener((AdapterView.OnItemClickListener) this);
runOnUiThread(new Runnable() {
#Override
public void run() {
new ReadJSON().execute(url);
}
});
final ImageButton filteropen = (ImageButton) findViewById(R.id.aufklaupen);
filteropen.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
RelativeLayout filter = (RelativeLayout) findViewById(R.id.filterloc);
filter.setVisibility(View.VISIBLE);
ImageButton filterclose = (ImageButton) findViewById(R.id.zuklappen);
filterclose.setVisibility(View.VISIBLE);
filteropen.setVisibility(View.INVISIBLE);
}
});
final ImageButton filterclose = (ImageButton) findViewById(R.id.zuklappen);
filterclose.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
RelativeLayout filter = (RelativeLayout) findViewById(R.id.filterloc);
filter.setVisibility(View.INVISIBLE);
ImageButton filteropen = (ImageButton) findViewById(R.id.aufklaupen);
filteropen.setVisibility(View.VISIBLE);
filterclose.setVisibility(View.INVISIBLE);
}
});
}
class ReadJSON extends AsyncTask<String,Integer,String> {
#Override
protected String doInBackground(String... params) {
return readURL(params[0]);
}
#Override
protected void onPostExecute(String content) {
try{
JSONObject jo = new JSONObject(content);
JSONArray ja = jo.getJSONArray("contacts");
for(int i=0;i<ja.length();i++){
JSONObject po = ja.getJSONObject(i);
arrayList.add(new productforloc(
po.getString("imageurl"),
po.getString("name"),
po.getString("street"),
po.getString("postalcode"),
po.getString("musicstyle"),
po.getString("musicsecond"),
po.getString("entry"),
po.getString("opening"),
po.getString("agegroup"),
po.getString("urlbtn"),
po.getString("Fsk"),
po.getString("city"),
po.getString("bg")
));
}
} catch (JSONException e) {
e.printStackTrace();
}
final CustomListAdapterforloc adapter = new CustomListAdapterforloc(getApplicationContext(),R.layout.model,arrayList);
lv.setAdapter(adapter);
if(pDialog.isShowing()){
pDialog.dismiss();
}
}
}
private String readURL(String url){
StringBuilder content = new StringBuilder();
try{
URL uri = new URL(url);
URLConnection urlConnection = uri.openConnection();
BufferedReader bufferedReader= new BufferedReader(new InputStreamReader(urlConnection.getInputStream()));
String line;
while((line = bufferedReader.readLine()) !=null){
content.append(line+"\n");
}
bufferedReader.close();
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return content.toString();
}
#Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
productforloc pForloc = arrayList.get(position);
Intent intent = new Intent();
intent.setClass(this,DetailActivity.class);
intent.putExtra("name",pForloc.getName());
intent.putExtra("imageurl",pForloc.getImage());
intent.putExtra("street",pForloc.getStreet());
intent.putExtra("postalcode",pForloc.getPostalcode());
intent.putExtra("entry",pForloc.getEntry());
intent.putExtra("agegroup",pForloc.getAgegroup());
intent.putExtra("opening",pForloc.getOpening());
intent.putExtra("urlbtn",pForloc.getUrlbtn());
intent.putExtra("Fsk",pForloc.getFsk());
intent.putExtra("city",pForloc.getCity());
intent.putExtra("musicstyle",pForloc.getMusicstyle());
intent.putExtra("musicsecond",pForloc.getMusicsecond());
intent.putExtra("bg",pForloc.getBg());
startActivity(intent);
}
/**
* Async task class to get json by making HTTP call
}
*/
}
and here is my Customlistadapter Activity:
public class CustomListAdapterforloc extends ArrayAdapter<productforloc>{
ArrayList<productforloc> products;
Context context;
int resource;
public CustomListAdapterforloc(Context context, int resource, List<productforloc> products) {
super(context, resource, products);
this.products = (ArrayList<productforloc>) products;
this.context = context;
this.resource = resource;
}
#NonNull
#Override
public View getView(int position, View convertView, ViewGroup parent) {
if(convertView== null){
LayoutInflater layoutInflater = (LayoutInflater) getContext().getSystemService(Activity.LAYOUT_INFLATER_SERVICE);
convertView = layoutInflater.inflate(R.layout.model,null,true);
}
productforloc product = getItem(position);
ImageView imageView = (ImageView) convertView.findViewById(R.id.imagelist);
Picasso.with(context).load(product.getImage()).into(imageView);
TextView txtName= (TextView) convertView.findViewById(R.id.namelist);
txtName.setText(product.getName());
return convertView;
}
}

i solved it using this code in my MAinActivity:
public class Locations extends AppCompatActivity {
private String TAG = Locations.class.getSimpleName();
private ProgressDialog pDialog;
private ListView lv;
// URL to get contacts JSON
private static String url = "http://partypeople.bplaced.net/loli.php";
ArrayList<HashMap<String, String>> contactList;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
contactList = new ArrayList<>();
lv = (ListView) findViewById(R.id.lv);
new GetContacts().execute();
}
/**
* Async task class to get json by making HTTP call
*/
private class GetContacts extends AsyncTask<Void, Void, Void> {
#Override
protected void onPreExecute() {
super.onPreExecute();
// Showing progress dialog
pDialog = new ProgressDialog(Locations.this);
pDialog.setMessage("Please wait...");
pDialog.setCancelable(false);
pDialog.show();
}
#Override
protected Void doInBackground(Void... arg0) {
HttpHandler sh = new HttpHandler();
// Making a request to url and getting response
String jsonStr = sh.makeServiceCall(url);
Log.e(TAG, "Response from url: " + jsonStr);
if (jsonStr != null) {
try {
JSONArray contacts = new JSONArray(jsonStr);
// Getting JSON Array node
// looping through All Contacts
for (int i = 0; i < contacts.length(); i++) {
JSONObject c = contacts.getJSONObject(i);
String id = c.getString("id");
String name = c.getString("name");
String email = c.getString("email");
String address = c.getString("address");
String gender = c.getString("gender");
// tmp hash map for single contact
HashMap<String, String> contact = new HashMap<>();
// adding each child node to HashMap key => value
contact.put("id", id);
contact.put("name", name);
contact.put("email", email);
// adding contact to contact list
contactList.add(contact);
}
} catch (final JSONException e) {
Log.e(TAG, "Json parsing error: " + e.getMessage());
runOnUiThread(new Runnable() {
#Override
public void run() {
Toast.makeText(getApplicationContext(),
"Json parsing error: " + e.getMessage(),
Toast.LENGTH_LONG)
.show();
}
});
}
} else {
Log.e(TAG, "Couldn't get json from server.");
runOnUiThread(new Runnable() {
#Override
public void run() {
Toast.makeText(getApplicationContext(),
"Couldn't get json from server. Check LogCat for possible errors!",
Toast.LENGTH_LONG)
.show();
}
});
}
return null;
}
#Override
protected void onPostExecute(Void result) {
super.onPostExecute(result);
// Dismiss the progress dialog
if (pDialog.isShowing())
pDialog.dismiss();
/**3
* Updating parsed JSON data into ListView
* */
ListAdapter adapter = new SimpleAdapter(
Locations.this, contactList,
R.layout.model, new String[]{"name", "email",
"mobile"}, new int[]{R.id.namelist,
});
lv.setAdapter(adapter);
}
}
and used in my CustomlistadapterActivity:
public class HttpHandler {
private static final String TAG = HttpHandler.class.getSimpleName();
public HttpHandler() {
}
public String makeServiceCall(String reqUrl) {
String response = null;
try {
URL url = new URL(reqUrl);
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setRequestMethod("GET");
// read the response
InputStream in = new BufferedInputStream(conn.getInputStream());
response = convertStreamToString(in);
} catch (MalformedURLException e) {
Log.e(TAG, "MalformedURLException: " + e.getMessage());
} catch (ProtocolException e) {
Log.e(TAG, "ProtocolException: " + e.getMessage());
} catch (IOException e) {
Log.e(TAG, "IOException: " + e.getMessage());
} catch (Exception e) {
Log.e(TAG, "Exception: " + e.getMessage());
}
return response;
}
private String convertStreamToString(InputStream is) {
BufferedReader reader = new BufferedReader(new InputStreamReader(is));
StringBuilder sb = new StringBuilder();
String line;
try {
while ((line = reader.readLine()) != null) {
sb.append(line).append('\n');
}
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
is.close();
} catch (IOException e) {
e.printStackTrace();
}
}
return sb.toString();
}
}
Thanks for your input

Override getCount method into adapter class.

I am trying to parse a data from the following link

"http://soccer.sportsopendata.net/v1/leagues/premier-league/seasons/16-17/standings" - Link Which Iam Trying to parse
public class MainActivity extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
final Button GetServerData = (Button) findViewById(R.id.GetServerData);
GetServerData.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
// WebServer Request URL
String serverURL = "http://soccer.sportsopendata.net/v1/leagues/premier-league/seasons/16-17/standings";
// Use AsyncTask execute Method To Prevent ANR Problem
new LongOperation().execute(serverURL);
}
});
}
private class LongOperation extends AsyncTask<String, Void, Void> {
private final HttpClient Client = new DefaultHttpClient();
private String Content;
private String Error = null;
private ProgressDialog Dialog = new ProgressDialog(MainActivity.this);
String data = "";
TextView uiUpdate = (TextView) findViewById(R.id.textView2);
TextView jsonParsed = (TextView) findViewById(R.id.textView3);
int sizeData = 0;
EditText serverText = (EditText) findViewById(R.id.textView);
protected void onPreExecute() {
// NOTE: You can call UI Element here.
//Start Progress Dialog (Message)
Dialog.setMessage("Please wait..");
Dialog.show();
try {
// Set Request parameter
data += "&" + URLEncoder.encode("data", "UTF-8") + "=" + serverText.getText();
} catch (UnsupportedEncodingException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
#Override
protected Void doInBackground(String... urls) {
/************ Make Post Call To Web Server ***********/
BufferedReader reader = null;
// Send data
try {
// Defined URL where to send data
URL url = new URL(urls[0]);
// Send POST data request
URLConnection conn = url.openConnection();
conn.setDoOutput(true);
OutputStreamWriter wr = new OutputStreamWriter(conn.getOutputStream());
wr.write(data);
wr.flush();
// Get the server response
reader = new BufferedReader(new InputStreamReader(conn.getInputStream()));
StringBuilder sb = new StringBuilder();
String line = null;
// Read Server Response
while ((line = reader.readLine()) != null) {
// Append server response in string
sb.append(line + "");
}
// Append Server Response To Content String
Content = sb.toString();
} catch (Exception e) {
Error = e.getMessage();
} finally {
try {
reader.close();
} catch (Exception ex) {
}
}
return null;
}
protected void onPostExecute(Void unused) {
// NOTE: You can call UI Element here.
// Close progress dialog
Dialog.dismiss();
if (Error != null) {
uiUpdate.setText("Output : " + Error);
}else
{
//Show Response Json Onscreen(Activity)
uiUpdate.setText( Content );
/****************** Start Parse Response JSON Data *************/
String OutputData = "";
try {
JSONObject jsono = new JSONObject(Content);
JSONObject mainObject = jsono.getJSONObject("data");
JSONArray jsonArray = mainObject.getJSONArray("standing");
for (int i = 0; i < jsonArray.length(); i++) {
JSONObject object = jsonArray.getJSONObject(i);
// get details2 JSONObject
String position = object.optString("position").toString();
String team = object.optString("team").toString();
OutputData += "Position: " + position + " "
+ "Team Name : " + team + " ";
}
/****************** End Parse Response JSON Data *************/
//Show Parsed Output on screen (activity)
jsonParsed.setText( OutputData );
}catch (JSONException e) {
e.printStackTrace();
}
}
}
}
}
**I am Creating a premier league application which shows all the datas needed for a premier league fan. As Iam new to this I am getting confused over json parsing and getting data from apis. So Can anyone Explain to me how to change my code or Some links which would help me correct it.
Above given is my java code of Main Activity.**

Thank You Everyone for Helping out. But I found my answer from the search over the internet. Here I used VOLLEY to call the link.
JSON PARSER CLASS
public class ParseJSON {
public static String[] position1;
public static String[] team;
public static String[] points;
public static final String JSON_ARRAY = "data";
public static final String CHILD_ARRAY = "standings";
public static final String KEY_ID = "position";
public static final String KEY_NAME = "team";
private JSONObject users = null;
private JSONArray user2=null;
private JSONObject user3=null;
private String json;
public ParseJSON(String json){
this.json = json;
}
protected void parseJSON() {
JSONObject jsonObject = null;
try {
jsonObject = new JSONObject(json);
users = jsonObject.getJSONObject(JSON_ARRAY);
try {
user2=users.getJSONArray(CHILD_ARRAY);
position1 = new String[user2.length()];
team = new String[user2.length()];
points=new String[user2.length()];
for (int i = 0; i < user2.length(); i++) {
JSONObject jo = user2.getJSONObject(i);
try {
user3=jo.getJSONObject("overall");
points[i] = user3.getString("points");
System.out.println("Message me: "+points[i]);
}catch (Exception e)
{
e.printStackTrace();
}
position1[i] = jo.getString(KEY_ID);
team[i] = jo.getString(KEY_NAME);
System.out.println("Message me: "+position1[i]);
System.out.println("Message me: "+team[i]);
}
}catch (Exception e)
{
e.printStackTrace();
}
} catch (JSONException e) {
e.printStackTrace();
}
}
}
Main Activity Class
public class MainActivity extends AppCompatActivity implements View.OnClickListener {
public static final String JSON_URL="http://soccer.sportsopendata.net/v1/leagues/premier-league/seasons/16-17/standings";
private Button buttonGet;
private ListView listView;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
buttonGet = (Button) findViewById(R.id.buttonGet);
buttonGet.setOnClickListener(this);
listView = (ListView) findViewById(R.id.listView);
}
#Override
public void onClick(View v) {
sendRequest();
}
private void sendRequest() {
final StringRequest stringRequest = new StringRequest(JSON_URL,
new Response.Listener<String>() {
#Override
public void onResponse(String response) {
showJSON(response);
}
},
new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
Toast.makeText(MainActivity.this, error.getMessage(), Toast.LENGTH_LONG).show();
}
});
RequestQueue requestQueue = Volley.newRequestQueue(this);
requestQueue.add(stringRequest);
}
private void showJSON(String json){
ParseJSON pj = new ParseJSON(json);
pj.parseJSON();
CustomList cl = new CustomList(this, ParseJSON.position1,ParseJSON.team,ParseJSON.points);
listView.setAdapter(cl);
}
}
Custom Class for adding datas to list view
public class CustomList extends ArrayAdapter<String> {
private String[] position1;
private String[] team;
private String[] points;
private Activity context;
public CustomList(Activity context, String[] position1, String[] team, String[] points) {
super(context, R.layout.list_view_layout, position1);
this.context = context;
this.position1 = position1;
this.team = team;
this.points = points;
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
LayoutInflater inflater = context.getLayoutInflater();
View listViewItem = inflater.inflate(R.layout.list_view_layout, null, true);
TextView pos1 = (TextView) listViewItem.findViewById(R.id.position1);
TextView teamname = (TextView) listViewItem.findViewById(R.id.teamname);
TextView points1 = (TextView) listViewItem.findViewById(R.id.points);
pos1.setText("Position: "+position1[position]);
teamname.setText("Team: "+team[position]);
points1.setText("Points: "+points[position]);
return listViewItem;
}
}

Step 1 : Use Retroft + RxJava for Asynchronous API calls
Step 2 : Use Gson to Serialize and Deserialize.
Step 3 : Use json to POJO to have a Model Class
Simplify the code.

Android Fragment - SlidingMenu - ListActivity

So I have the slidingmenu(jfeinstein10) library added to my project and the menu working. The problem I have run into is based on my app extends ListActivity.
I have seen a couple questions about this and most suggest extending to Fragment to get Fragments working for the menu. I wanted to know if there was a way to not use Fragments to get the menu list to work.
Every time I move to SlidingFragmentActivity or any other Fragment Activity, onListItemClick and other methods start breaking.
Below is my code:
public class MainListActivity extends ListActivity {
public static final int NUMBER_OF_POSTS = 20;
public static final String TAG = MainListActivity.class.getSimpleName();
protected JSONObject mBlogData;
protected ProgressBar mProgressBar;
private SlidingMenu menu;
static final String KEY_TITLE = "title";
static final String KEY_AUTHOR = "author";
static final String KEY_IMAGE = "image";
ListView list;
LazyAdapter adapter;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
//setBehindContentView(R.layout.menu_frame);
mProgressBar = (ProgressBar) findViewById(R.id.progressBar1);
menu = new SlidingMenu(this);
menu.setMode(SlidingMenu.LEFT);
menu.setTouchModeAbove(SlidingMenu.TOUCHMODE_FULLSCREEN);
menu.setShadowWidth(5);
menu.setFadeDegree(0.35f);
menu.attachToActivity(this, SlidingMenu.SLIDING_CONTENT);
menu.setBehindWidth(R.dimen.shadow_width);
menu.setShadowDrawable(R.drawable.shadow);
menu.setBehindOffsetRes(R.dimen.slidingmenu_offset);
menu.setMenu(R.layout.menu_frame);
//getFragmentManager().beginTransaction().replace(R.id.menu_frame, new MenuFragment()).commit();
if(isNetworkAvailable()){
GetBlogPostsTask getBlogPostsTask = new GetBlogPostsTask();
mProgressBar.setVisibility(View.VISIBLE);
getBlogPostsTask.execute();
}else{
Toast.makeText(this, "Network is unavailable", Toast.LENGTH_LONG).show();
}
}
#Override
protected void onListItemClick(ListView l, View v, int position, long id){
super.onListItemClick(l, v, position, id);
try{
JSONArray jsonPosts = mBlogData.getJSONArray("items");
JSONObject jsonPost = jsonPosts.getJSONObject(position);
String blogSummary = jsonPost.getString("summary");
String blogUrl = jsonPost.getString("bitly");
Intent intent = new Intent(this, BlogWebViewActivity.class);
intent.setData(Uri.parse(blogSummary));
intent.putExtra("mUrl",blogUrl);
startActivity(intent);
}catch(JSONException e){
logException(e);
}
}
private void logException(Exception e) {
Log.e(TAG, "Exception caught!", e);
}
private boolean isNetworkAvailable() {
ConnectivityManager manager = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo networkInfo = manager.getActiveNetworkInfo();
boolean isAvailable = false;
if(networkInfo != null && networkInfo.isConnected()){
isAvailable = true;
}
return isAvailable;
}
public void handleBlogResponse() {
mProgressBar.setVisibility(View.INVISIBLE);
if(mBlogData == null){
updateDisplayForError();
}else{
try {
JSONArray jsonPosts = mBlogData.getJSONArray("items");
ArrayList<HashMap<String,String>> blogPosts = new ArrayList<HashMap<String,String>>();
for (int i=0;i<jsonPosts.length();i++){
JSONObject post = jsonPosts.getJSONObject(i);
String title = post.getString(KEY_TITLE);
title = Html.fromHtml(title).toString();
String tag = post.getString(KEY_AUTHOR);
tag = Html.fromHtml(tag).toString();
String image = post.getString(KEY_IMAGE);
image = Html.fromHtml(image).toString();
HashMap<String, String> blogPost = new HashMap<String,String>();
blogPost.put(KEY_TITLE, title);
blogPost.put(KEY_AUTHOR, tag);;
blogPost.put(KEY_IMAGE, image);
blogPosts.add(blogPost);
}
list=getListView();
LazyAdapter adapter = new LazyAdapter(this, blogPosts);
list.setAdapter(adapter);
} catch (JSONException e) {
logException(e);
}
}
}
private void updateDisplayForError() {
AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setTitle(getString(R.string.error_title));
builder.setMessage(getString(R.string.error_message));
builder.setPositiveButton(android.R.string.ok,null);
AlertDialog dialog = builder.create();
dialog.show();
TextView emptyTextView = (TextView) getListView().getEmptyView();
emptyTextView.setText(getString(R.string.no_items));
}
private class GetBlogPostsTask extends AsyncTask<Object, Void, JSONObject>{
#Override
protected JSONObject doInBackground(Object... params) {
int responseCode = -1;
JSONObject jsonResponse = null;
StringBuilder builder = new StringBuilder();
HttpClient client = new DefaultHttpClient();
HttpGet httpget = new HttpGet("http://www.domain.com/app_json.js");
try {
HttpResponse response = client.execute(httpget);
StatusLine statusLine = response.getStatusLine();
responseCode = statusLine.getStatusCode();
if(responseCode == HttpURLConnection.HTTP_OK){
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);
}
jsonResponse = new JSONObject(builder.toString());
}else{
Log.i(TAG, "HTTP Failed: "+responseCode);
}
} catch (MalformedURLException e) {
logException(e);
} catch (IOException e) {
logException(e);
}
catch(Exception e){
logException(e);
}
return jsonResponse;
}
#Override
protected void onPostExecute(JSONObject result){
mBlogData = result;
handleBlogResponse();
}
}
#Override
public void onBackPressed() {
if (menu.isMenuShowing()) {
menu.showContent();
} else {
super.onBackPressed();
}
}
}
I have the menu items stored in /values/array.xml as a string-array.
I have setup a fragment as well, but dont know how to access it without extending to Fragment from ListActivity.
Below is my Fragment based on the example fragments from github:
public class MenuFragment extends ListFragment {
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
return inflater.inflate(R.layout.menu_list, null);
}
#Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
String[] colors = getResources().getStringArray(R.array.menu_items);
ArrayAdapter<String> colorAdapter = new ArrayAdapter<String>(getActivity(),
android.R.layout.simple_list_item_1, android.R.id.text1, colors);
setListAdapter(colorAdapter);
}
#Override
public void onListItemClick(ListView lv, View v, int position, long id) {
Fragment newContent = null;
switch (position) {
case 0:
//newContent = new ColorFragment(R.color.red);
break;
case 1:
//newContent = new ColorFragment(R.color.green);
break;
case 2:
//newContent = new ColorFragment(R.color.blue);
break;
case 3:
//newContent = new ColorFragment(android.R.color.white);
break;
case 4:
//newContent = new ColorFragment(android.R.color.black);
break;
}
if (newContent != null)
switchFragment(newContent);
}
// the meat of switching the above fragment
private void switchFragment(Fragment fragment) {
if (getActivity() == null)
return;
}
}
Thanks

how to parsing with json from 2 different server?

i need help here.
i wanna do parse with json from 2 url server and then show the array at 1 listview.
this's my code.
public class MainActivity extends Activity {
private JSONObject jObject;
private String jsonResult ="";
private JSONObject jObject2;
private String jsonResult2 ="";
private String url = "http://10.0.2.2/kota/daftarkota.php";
private String url2 = "http://10.0.2.2/kota/delkota.php";
private String url3 = "http://www.hatsa.byethost33.com/kota_daftarkota.php";
String[] daftarid;
String[] daftarnama;
String[] daftarlatitude;
String[] daftarlongitude;
Menu menu;
public static MainActivity ma;
/** Called when the activity is first created. */
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
ma=this;
RefreshList();
}
public void RefreshList() {
try {
jsonResult = getRequest(url);
jObject = new JSONObject(jsonResult);
JSONArray menuitemArray = jObject.getJSONArray("kota");
daftarid = new String[menuitemArray.length()];
daftarnama = new String[menuitemArray.length()];
daftarlatitude = new String[menuitemArray.length()];
daftarlongitude = new String[menuitemArray.length()];
for (int i = 0; i < menuitemArray.length(); i++)
{
daftarid[i] = menuitemArray.getJSONObject(i).getString("id").toString();
daftarnama[i] = menuitemArray.getJSONObject(i).getString("nama").toString();
daftarlatitude[i] = menuitemArray.getJSONObject(i).getString("latitude").toString();
daftarlongitude[i] = menuitemArray.getJSONObject(i).getString("longitude").toString();
}
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
try {
jsonResult2 = getRequest(url3);
jObject2 = new JSONObject(jsonResult2);
JSONArray menuitemArray = jObject2.getJSONArray("kota");
daftarid = new String[menuitemArray.length()];
daftarnama = new String[menuitemArray.length()];
daftarlatitude = new String[menuitemArray.length()];
daftarlongitude = new String[menuitemArray.length()];
for (int i = 0; i < menuitemArray.length(); i++)
{
daftarid[i] = menuitemArray.getJSONObject(i).getString("id").toString();
daftarnama[i] = menuitemArray.getJSONObject(i).getString("nama").toString();
daftarlatitude[i] = menuitemArray.getJSONObject(i).getString("latitude").toString();
daftarlongitude[i] = menuitemArray.getJSONObject(i).getString("longitude").toString();
}
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
ListView ListView01 = (ListView)findViewById(R.id.ListView01);
ListView01.setAdapter(new ArrayAdapter(this, android.R.layout.simple_list_item_1, daftarnama));
ListView01.setSelected(true);
ListView01.setOnItemClickListener(new OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,
long arg3) {
final String selectionid = daftarid[arg2];
final String selectionnama = daftarnama[arg2];
final String selectionlatitude = daftarlatitude[arg2];
final String selectionlongitude = daftarlongitude[arg2];
final CharSequence[] dialogitem = {"Edit", "Delete"};
AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this);
builder.setTitle("Pilih ?");
builder.setItems(dialogitem, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int item) {
switch(item){
case 0 :
Intent i = new Intent(getApplicationContext(), EditActivity.class);
i.putExtra("id", selectionid);
i.putExtra("nama", selectionnama);
i.putExtra("latitude", selectionlatitude);
i.putExtra("longitude", selectionlongitude);
startActivity(i);
break;
case 1 :
getRequest(url2 + "?id=" + selectionid);
RefreshList();
break;
}
}
});
builder.create().show();
}});
((ArrayAdapter)ListView01.getAdapter()).notifyDataSetInvalidated();
}
/**
* Method untuk Mengirimkan data ke server
*/
public String getRequest(String Url){
String sret="";
HttpClient client = new DefaultHttpClient();
HttpGet request = new HttpGet(Url);
try{
HttpResponse response = client.execute(request);
sret =request(response);
}catch(Exception ex){
Toast.makeText(this,"Gagal "+sret, Toast.LENGTH_SHORT).show();
}
return sret;
}
/**
* Method untuk Menerima data dari server
*/
public static String request(HttpResponse response){
String result = "";
try{
InputStream in = response.getEntity().getContent();
BufferedReader reader = new BufferedReader(new InputStreamReader(in));
StringBuilder str = new StringBuilder();
String line = null;
while((line = reader.readLine()) != null){
str.append(line + "\n");
}
in.close();
result = str.toString();
}catch(Exception ex){
result = "Error";
}
return result;
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
this.menu = menu;
menu.add(0, 1, 0, "Tambah").setIcon(android.R.drawable.btn_plus);
menu.add(0, 2, 0, "Refresh").setIcon(android.R.drawable.ic_menu_rotate);
menu.add(0, 3, 0, "Exit").setIcon(android.R.drawable.ic_menu_close_clear_cancel);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case 1:
Intent i = new Intent(MainActivity.this, AddActivity.class);
startActivity(i);
return true;
case 2:
RefreshList();
return true;
case 3:
finish();
return true;
}
return false;
}
}
if i run it, the listview only show me the array from 'url' and there's nothing from 'url3'.
i don't know how should my code is, if i wanna make the listview show the array from 'url' and 'url3'.
thanks. :)

It actually looks the other way around. I guess you see the data from url3, since you create the array daftarnama twice - the second time with the data from url3. Use a List<String> instead of the array. Create the list just once and then add all the items from both urls. Also, you should rethink your code. You have a lot of duplicate code here (DRY - don't repeat yourself).

Android: adapter.notifydatasetchanged()

i want to create a dynamic GridView, and when i click to my options meny, i refresh my asyncTask, then i get all result's from postExecute, and notify my adapter to refresh! But i doesn't work HELP me please!
GridView grid;
ImageAdapter adapter;
ArrayList<String> arrayThumbs = new ArrayList<String>();
ArrayList<String> arrayBig_image = new ArrayList<String>();
ArrayList<String> arrayAuthor = new ArrayList<String>();
ArrayList<String> arrayDescription = new ArrayList<String>();
ArrayList<String> arrayDate = new ArrayList<String>();
String[] arraymThumbs;
String[] arrayBimages;
String[] arrayauthor;
String[] arraydescription;
String[] arraydate;
final static String TAG_ITEM = "img_list";
final static String TAG_THUMBNAILS = "thumbnail";
final static String TAG_BIG_IMAGE = "big_image";
final static String TAG_AUTHOR = "author";
final static String TAG_DESCRIPTION = "description";
final static String TAG_DATE = "event_date";
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
backTask();
grid = (GridView) findViewById(R.id.grid);
grid.setAdapter(adapter);
grid.setOnItemClickListener(new OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> adapterview, View view, int position, long id) {
Intent intent = new Intent(MainActivity.this, ImageGallery.class);
intent.putExtra("position", position);
intent.putExtra("big_images", arrayBimages);
intent.putExtra("author", arrayauthor);
intent.putExtra("description", arraydescription);
intent.putExtra("date", arraydate);
startActivity(intent);
}
});
}
public boolean onCreateOptionsMenu(Menu menu){
getMenuInflater().inflate(R.menu.main, menu);
return super.onCreateOptionsMenu(menu);
}
public boolean onOptionsItemSelected(MenuItem item){
switch (item.getItemId()) {
case R.id.refresh:
backTask();
break;
}
return super.onOptionsItemSelected(item);
}
public void backTask(){
BackTask task = new BackTask();
task.execute();
try {
JSONObject result = task.get();
if(result != null){
JSONArray jarray = result.getJSONArray(TAG_ITEM);
for(int i = 0; i < jarray.length(); i++){
JSONObject jrss = jarray.getJSONObject(i);
arrayThumbs.add(jrss.getString(TAG_THUMBNAILS));
arrayBig_image.add(jrss.getString(TAG_BIG_IMAGE));
arrayAuthor.add(jrss.getString(TAG_AUTHOR));
arrayDescription.add(jrss.getString(TAG_DESCRIPTION));
arrayDate.add(jrss.getString(TAG_DATE));
Log.d("LLLLLOOOOGGGG", jrss.getString("author")+"\n");
}}
else{
AlertDialog.Builder alertNetworkError = new AlertDialog.Builder(this);
alertNetworkError.setMessage("нет подключения к интернету");
alertNetworkError.setNegativeButton("Выйти", new DialogInterface.OnClickListener() {
#Override
public void onClick(DialogInterface dialog, int which) {
finish();
}
});
alertNetworkError.create();
alertNetworkError.show();
}
} catch (InterruptedException e) {
e.printStackTrace();
} catch (ExecutionException e) {
e.printStackTrace();
} catch (JSONException e) {
e.printStackTrace();
}
arraymThumbs = new String[arrayThumbs.size()];
arraymThumbs = arrayThumbs.toArray(arraymThumbs);
arrayBimages = new String[arrayBig_image.size()];
arrayBimages = arrayBig_image.toArray(arrayBimages);
arrayauthor = new String[arrayAuthor.size()];
arrayauthor = arrayAuthor.toArray(arrayauthor);
arraydescription = new String[arrayDescription.size()];
arraydescription = arrayDescription.toArray(arraydescription);
arraydate = new String[arrayDate.size()];
arraydate = arrayDate.toArray(arraydate);
adapter = new ImageAdapter(MainActivity.this, arraymThumbs);
adapter.notifyDataSetChanged();
}
And my image adapter here i get all result's from asyncTask and print thumbs images to my GridView
public class ImageAdapter extends BaseAdapter {
public Context mContext;
String[] mThumbs;
public LayoutInflater inflater;
public DisplayImageOptions options;
public ImageLoader imageLoader;
public ImageAdapter (Context c, String[] arrayhumbss){
mContext = c;
inflater = (LayoutInflater) mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
mThumbs = arrayhumbss;
options = new DisplayImageOptions.Builder()
.showStubImage(R.drawable.ic_contact_picture_2)
.showImageForEmptyUri(R.drawable.ic_launcher)
.cacheInMemory()
.cacheOnDisc()
.bitmapConfig(Bitmap.Config.RGB_565)
.build();
imageLoader = ImageLoader.getInstance();
imageLoader.init(ImageLoaderConfiguration.createDefault(c));
}
#Override
public int getCount() {
return mThumbs.length;
}
#Override
public Object getItem(int position) {
return position;
}
#Override
public long getItemId(int position) {
return 0;
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
final ImageView imageView;
if (convertView == null) {
imageView = (ImageView) inflater.inflate(R.layout.grid_item, parent, false);
} else {
imageView = (ImageView) convertView;
}
imageLoader.displayImage(mThumbs[position], imageView, options);
return imageView;
}
}
This is my BACKTASK
public class BackTask extends AsyncTask<String, Void, JSONObject>{
#Override
protected JSONObject doInBackground(String... params) {
InputStream ips = null;
JSONObject jsonObj = null;
String json = "";
try {
DefaultHttpClient httpClient = new DefaultHttpClient();
HttpResponse response = httpClient.execute(new HttpPost("http://192.168.1.179/lenta/image.js"));
ips = response.getEntity().getContent();
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
try {
BufferedReader bufff = new BufferedReader(new InputStreamReader(ips, "UTF-8"));
StringBuilder sb = new StringBuilder();
String line = null;
while ((line = bufff.readLine()) != null){
sb.append(line + "\n");
}
ips.close();
json = sb.toString();
} catch (Exception e) {
e.printStackTrace();
}
try {
jsonObj = new JSONObject(json);
} catch (JSONException e) {
e.printStackTrace();
}
return jsonObj;
}
#Override
protected void onPostExecute(JSONObject result){
super.onPostExecute(result);
}
}
here i handle my json from url, and in MainActivity i get this form task.get()

Add grid.setAdapter(adapter) right after this line
adapter = new ImageAdapter(MainActivity.this, arraymThumbs);
Hope this would solve your problem.
EDIT: P.S. It seems you need to read something, because i think you don't fully understand what adapter is and how to use it.

Use this :
adapter = new ImageAdapter(YourActivity.this, arraymThumbs);
myGridView.setAdapter(adapter);
Hope this helps you.
Thanks.

Develop Reference

The Android operating system is a mobile operating system that was developed by Google (GOOGL?) to be primarily used for touchscreen devices, cell phones, and tablets.

Solve startActivity in fragment - android

You should start new Activity using Activity context: getActivity.startActivity(intent);

This is a Fragment class, so you are not able to pass an Intentby simply writing this.startActivity(); What you need to do is to get the Activity of this Fragment class. So instead of mContext.startActivity(intent); you should write : getActivity().startActivity(intent);

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how to parsing with json from 2 different server?

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