Message Toast dans un ContentResolver

Question

Je veux sélectionner un contact et afficher le numéro en tant que message Toast avec le paramètre onActivityResult. Mon problème est après que j'ai choisi un contact et que je veux afficher le nombre mon programme se bloque.

Voici le code:

@Override 
protected void onActivityResult(int requestCode, int resultCode, Intent data) { 

    if (requestCode == PICK_CONTACT) { 

     if (resultCode == RESULT_OK) { 

      Uri contactUri = data.getData(); 

      String[] projection = { Phone.NUMBER }; 

      Cursor cursor = getContentResolver().query(contactUri, 
        projection, null, null, null); 
      cursor.moveToFirst(); 


      int column = cursor.getColumnIndex(Phone.NUMBER); 
      String number = cursor.getString(column); 

      // Should Display the number as Toast 
      Toast.makeText(null, number, Toast.LENGTH_SHORT).show(); 

     } 
    } 
} 

et StackTrace

05-20 16:48:31.990: E/AndroidRuntime(9222): FATAL EXCEPTION: main 
05-20 16:48:31.990: E/AndroidRuntime(9222): Process: com.alphabuddy.test, PID: 9222 
05-20 16:48:31.990: E/AndroidRuntime(9222): java.lang.RuntimeException: Failure delivering result ResultInfo{who=null, request=1, result=-1, data=Intent { dat=content: (has extras) }} to activity {com.alphabuddy.test/com.alphabuddy.test.Satabase}: java.lang.NullPointerException 
05-20 16:48:31.990: E/AndroidRuntime(9222):  at android.app.ActivityThread.deliverResults(ActivityThread.java) 
05-20 16:48:31.990: E/AndroidRuntime(9222):  at android.app.ActivityThread.handleSendResult(ActivityThread.java) 
05-20 16:48:31.990: E/AndroidRuntime(9222):  at android.app.ActivityThread.access$1300(ActivityThread.java) 
05-20 16:48:31.990: E/AndroidRuntime(9222):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java) 
05-20 16:48:31.990: E/AndroidRuntime(9222):  at android.os.Handler.dispatchMessage(Handler.java) 
05-20 16:48:31.990: E/AndroidRuntime(9222):  at android.os.Looper.loop(Looper.java) 
05-20 16:48:31.990: E/AndroidRuntime(9222):  at android.app.ActivityThread.main(ActivityThread.java) 
05-20 16:48:31.990: E/AndroidRuntime(9222):  at java.lang.reflect.Method.invokeNative(Native Method) 
05-20 16:48:31.990: E/AndroidRuntime(9222):  at java.lang.reflect.Method.invoke(Method.java) 
05-20 16:48:31.990: E/AndroidRuntime(9222):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java) 
05-20 16:48:31.990: E/AndroidRuntime(9222):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java) 
05-20 16:48:31.990: E/AndroidRuntime(9222):  at dalvik.system.NativeStart.main(Native Method) 
05-20 16:48:31.990: E/AndroidRuntime(9222): Caused by: java.lang.NullPointerException 
05-20 16:48:31.990: E/AndroidRuntime(9222):  at android.widget.Toast.<init>(Toast.java) 
05-20 16:48:31.990: E/AndroidRuntime(9222):  at android.widget.Toast.makeText(Toast.java) 
05-20 16:48:31.990: E/AndroidRuntime(9222):  at com.alphabuddy.test.Satabase.onActivityResult(Satabase.java:72) 
05-20 16:48:31.990: E/AndroidRuntime(9222):  at android.app.Activity.dispatchActivityResult(Activity.java) 
05-20 16:48:31.990: E/AndroidRuntime(9222):  ... 12 more 

Answer 1

Au lieu de

Toast.makeText(null, number, Toast.LENGTH_SHORT).show(); 

utilisation

Toast.makeText(getApplicationContext(), ""+number, Toast.LENGTH_SHORT).show();