What is the error in this code?
I would like to add a facebook page name and get its json data, but there is something error I cannot discover. this example of url i use this These are all files I use and added logcat messages:
PagesActivity.java
package com.engahmedphp.facebookcollector; import org.json.JSONException; import org.json.JSONObject; import android.os.AsyncTask; import android.os.Bundle; import android.app.Activity; import android.app.AlertDialog; import android.app.ProgressDialog; import android.content.DialogInterface; import android.util.Log; import android.view.Menu; import android.view.View; import android.widget.Button; import android.widget.EditText; public class PagesActivity extends Activity { DatabaseHandler db = new DatabaseHandler(this); JSONObject json; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_pages); final Button button = (Button) findViewById(R.id.addPage); button.setOnClickListener(new View.OnClickListener() { public void onClick(View v) { AlertDialog.Builder alert = new AlertDialog.Builder( PagesActivity.this); alert.setTitle("Add New Page"); alert.setMessage("Enter Page Name OR Valid Facebook Link"); // Set an EditText view to get user input final EditText input = new EditText(PagesActivity.this); alert.setView(input); alert.setPositiveButton("Ok", new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int whichButton) { String value = input.getText().toString(); // Do something with value! String url = "http://graph.facebook.com/" + value + "/?fields=picture,name"; new MyAsyncTask().execute(url); } }); alert.setNegativeButton("Cancel", new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int whichButton) { // Canceled. } }); alert.show(); } }); } private class MyAsyncTask extends AsyncTask<String, Void, Void> { ProgressDialog mProgressDialog; @Override protected void onPostExecute(Void result) { try { String name = json.getString("name"); String fid = json.getString("id"); String picture = json.getJSONObject("picture") .getJSONObject("data").getString("url"); Log.d("name", name); Log.d("fid", fid); Log.d("picture", picture); db.addPage(name, fid, picture); } catch (JSONException e) { e.printStackTrace(); } mProgressDialog.dismiss(); } @Override protected void onPreExecute() { mProgressDialog = ProgressDialog.show(PagesActivity.this, "Loading...", "Data is Loading..."); } @Override protected Void doInBackground(String... params) { addPageData(params[0]); return null; } } public JSONObject addPageData(String url) { // Creating JSON Parser instance JSONParser jParser = new JSONParser(); // getting JSON string from URL json = jParser.getJSONFromUrl(url); return json; } @Override public boolean onCreateOptionsMenu(Menu menu) { // Inflate the menu; this adds items to the action bar if it is present. getMenuInflater().inflate(R.menu.splash, menu); return true; } } Logcat
08-31 08:21:35.972: W/System.err(8157): org.json.JSONException: No value for name 08-31 08:21:36.002: W/System.err(8157): at org.json.JSONObject.get(JSONObject.java:354) 08-31 08:21:36.002: W/System.err(8157): at org.json.JSONObject.getString(JSONObject.java:514) 08-31 08:21:36.002: W/System.err(8157): at com.engahmedphp.facebookcollector.PagesActivity$MyAsyncTask.onPostExecute(PagesActivity.java:82) 08-31 08:21:36.002: W/System.err(8157): at com.engahmedphp.facebookcollector.PagesActivity$MyAsyncTask.onPostExecute(PagesActivity.java:1) 08-31 08:21:36.012: W/System.err(8157): at android.os.AsyncTask.finish(AsyncTask.java:631) 08-31 08:21:36.032: W/System.err(8157): at android.os.AsyncTask.access$600(AsyncTask.java:177) 08-31 08:21:36.032: W/System.err(8157): at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:644) 08-31 08:21:36.032: W/System.err(8157): at android.os.Handler.dispatchMessage(Handler.java:99) 08-31 08:21:36.062: W/System.err(8157): at android.os.Looper.loop(Looper.java:137) 08-31 08:21:36.062: W/System.err(8157): at android.app.ActivityThread.main(ActivityThread.java:5103) 08-31 08:21:36.062: W/System.err(8157): at java.lang.reflect.Method.invokeNative(Native Method) 08-31 08:21:36.072: W/System.err(8157): at java.lang.reflect.Method.invoke(Method.java:525) 08-31 08:21:36.072: W/System.err(8157): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737) 08-31 08:21:36.072: W/System.err(8157): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553) 08-31 08:21:36.072: W/System.err(8157): at dalvik.system.NativeStart.main(Native Method) 08-31 08:21:36.072: I/Choreographer(8157): Skipped 72 frames! The application may be doing too much work on its main thread. do i get json object wrongly ?? or use Async incorrectly or what ??