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POError on start activity (NullPointerException) on Android Development
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  1. POError on start activity (NullPointerException) on Android Development
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    copied!<p><strong>Problem:</strong> Fail to start activity on button click from MainActiviy > MapActivity.</p> <p><strong>P/s:</strong> I following this map tutorial and changing the class name and copy all the elements to my project workspace. <a href="http://karnshah8890.blogspot.in/2013/03/google-places-api-tutorial.html" rel="nofollow">This Tutorial</a></p> <p><strong>Button listener</strong></p> <pre><code>public void onClick(View v) { Intent intent = new Intent(getApplicationContext(), MapActivity.class); startActivity(intent);} </code></pre> <p><strong>Logcat:</strong></p> <pre><code>07-31 02:22:58.267: E/AndroidRuntime(20784): FATAL EXCEPTION: main 07-31 02:22:58.267: E/AndroidRuntime(20784): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.fa.financeassistant/com.fa.financeassistant.MapActivity}: java.lang.NullPointerException 07-31 02:22:58.267: E/AndroidRuntime(20784): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2308) 07-31 02:22:58.267: E/AndroidRuntime(20784): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2358) 07-31 02:22:58.267: E/AndroidRuntime(20784): at android.app.ActivityThread.access$600(ActivityThread.java:153) 07-31 02:22:58.267: E/AndroidRuntime(20784): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1247) 07-31 02:22:58.267: E/AndroidRuntime(20784): at android.os.Handler.dispatchMessage(Handler.java:99) 07-31 02:22:58.267: E/AndroidRuntime(20784): at android.os.Looper.loop(Looper.java:137) 07-31 02:22:58.267: E/AndroidRuntime(20784): at android.app.ActivityThread.main(ActivityThread.java:5227) 07-31 02:22:58.267: E/AndroidRuntime(20784): at java.lang.reflect.Method.invokeNative(Native Method) 07-31 02:22:58.267: E/AndroidRuntime(20784): at java.lang.reflect.Method.invoke(Method.java:511) 07-31 02:22:58.267: E/AndroidRuntime(20784): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:795) 07-31 02:22:58.267: E/AndroidRuntime(20784): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:562) 07-31 02:22:58.267: E/AndroidRuntime(20784): at dalvik.system.NativeStart.main(Native Method) 07-31 02:22:58.267: E/AndroidRuntime(20784): Caused by: java.lang.NullPointerException 07-31 02:22:58.267: E/AndroidRuntime(20784): at com.fa.financeassistant.MapActivity.onCreate(MapActivity.java:46) 07-31 02:22:58.267: E/AndroidRuntime(20784): at android.app.Activity.performCreate(Activity.java:5104) 07-31 02:22:58.267: E/AndroidRuntime(20784): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080) 07-31 02:22:58.267: E/AndroidRuntime(20784): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2262) 07-31 02:22:58.267: E/AndroidRuntime(20784): ... 11 more </code></pre> <p><strong>My MapActivity Class</strong></p> <pre><code>package com.fa.financeassistant; import java.util.ArrayList; import android.R.array; import android.app.ActionBar; import android.app.Activity; import android.app.ProgressDialog; import android.content.Context; import android.location.Criteria; import android.location.Location; import android.location.LocationListener; import android.location.LocationManager; import android.os.AsyncTask; import android.os.Bundle; import android.util.Log; import android.view.Menu; import android.widget.ArrayAdapter; import com.google.android.gms.maps.CameraUpdateFactory; import com.google.android.gms.maps.GoogleMap; import com.google.android.gms.maps.MapFragment; import com.google.android.gms.maps.model.BitmapDescriptorFactory; import com.google.android.gms.maps.model.CameraPosition; import com.google.android.gms.maps.model.LatLng; import com.google.android.gms.maps.model.MarkerOptions; public class MapActivity extends Activity { private final String TAG = getClass().getSimpleName(); private GoogleMap mMap; private String[] places; private LocationManager locationManager; private Location loc; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.mapactivity); initCompo(); places = getResources().getStringArray(R.array.places); currentLocation(); final ActionBar actionBar = getActionBar(); actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_LIST); actionBar.setListNavigationCallbacks(ArrayAdapter.createFromResource( this, R.array.places, android.R.layout.simple_list_item_1), new ActionBar.OnNavigationListener() { @Override public boolean onNavigationItemSelected(int itemPosition, long itemId) { Log.e(TAG, places[itemPosition].toLowerCase().replace("-", "_")); if (loc != null) { mMap.clear(); new GetPlaces(MapActivity.this, places[itemPosition].toLowerCase().replace( "-", "_").replace(" ", "_")).execute(); } return true; } }); } private class GetPlaces extends AsyncTask&lt;Void, Void, ArrayList&lt;Place&gt;&gt; { private ProgressDialog dialog; private Context context; private String places; public GetPlaces(Context context, String places) { this.context = context; this.places = places; } @Override protected void onPostExecute(ArrayList&lt;Place&gt; result) { super.onPostExecute(result); if (dialog.isShowing()) { dialog.dismiss(); } for (int i = 0; i &lt; result.size(); i++) { mMap.addMarker(new MarkerOptions() .title(result.get(i).getName()) .position( new LatLng(result.get(i).getLatitude(), result .get(i).getLongitude())) .icon(BitmapDescriptorFactory .fromResource(R.drawable.pin)) .snippet(result.get(i).getVicinity())); } CameraPosition cameraPosition = new CameraPosition.Builder() .target(new LatLng(result.get(0).getLatitude(), result .get(0).getLongitude())) // Sets the center of the map to // Mountain View .zoom(14) // Sets the zoom .tilt(30) // Sets the tilt of the camera to 30 degrees .build(); // Creates a CameraPosition from the builder mMap.animateCamera(CameraUpdateFactory .newCameraPosition(cameraPosition)); } @Override protected void onPreExecute() { super.onPreExecute(); dialog = new ProgressDialog(context); dialog.setCancelable(false); dialog.setMessage("Loading"); dialog.isIndeterminate(); dialog.show(); } @Override protected ArrayList&lt;Place&gt; doInBackground(Void... arg0) { PlacesService service = new PlacesService( "AIzaSyBquLw9vJPDHAZO8kzKw6ft0bPxsgBmblg"); ArrayList&lt;Place&gt; findPlaces = service.findPlaces(loc.getLatitude(), // 28.632808 loc.getLongitude(), places); // 77.218276 for (int i = 0; i &lt; findPlaces.size(); i++) { Place placeDetail = findPlaces.get(i); Log.e(TAG, "places : " + placeDetail.getName()); } return findPlaces; } } private void initCompo() { mMap = ((MapFragment) getFragmentManager().findFragmentById(R.id.map)) .getMap(); } private void currentLocation() { locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE); String provider = locationManager .getBestProvider(new Criteria(), false); Location location = locationManager.getLastKnownLocation(provider); if (location == null) { locationManager.requestLocationUpdates(provider, 0, 0, listener); } else { loc = location; new GetPlaces(MapActivity.this, places[0].toLowerCase().replace( "-", "_")).execute(); Log.e(TAG, "location : " + location); } } private LocationListener listener = new LocationListener() { @Override public void onStatusChanged(String provider, int status, Bundle extras) { } @Override public void onProviderEnabled(String provider) { } @Override public void onProviderDisabled(String provider) { } @Override public void onLocationChanged(Location location) { Log.e(TAG, "location update : " + location); loc = location; locationManager.removeUpdates(listener); } }; } </code></pre> <p><strong>SOLUTION:</strong> Other than from the answer given below. I apply a quick fix by removing this line and work like a charm! Thanks to all who helped me. Have a nice day :)</p> <pre><code>android:theme="@style/Theme.NoTitle" </code></pre>
 

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