android - NullPointerException while trying to startActivityForResult -

android - NullPointerException while trying to startActivityForResult -

edit: reply not phone call startactivityforresult on called activity object, instead invoke caller's context.

this code, exception on lastly line:

107 intent intent = new intent(callingactivity.this, calledactivity.class); 108 calledactivity calledactivity = new calledactivity(); 109 calledactivity.startactivityforresult(intent, called_activity_code);

inside callingactivity:

@override protected void onactivityresult(int requestcode, int resultcode, intent data) { super.onactivityresult(requestcode, resultcode, data); log.i(sr.tag,"req=" + requestcode + " res=" + resultcode); //never getting here }

manifest file snippet:

<activity android:name=".ui.callingactivity" android:label="@string/app_name"> <intent-filter> <action android:name="android.intent.action.main" /> <category android:name="android.intent.category.launcher" /> </intent-filter> </activity> <activity android:name=".ui.calledactivity"></activity>

exception:

01-14 11:30:14.850: error/androidruntime(1036): fatal exception: main 01-14 11:30:14.850: error/androidruntime(1036): java.lang.nullpointerexception 01-14 11:30:14.850: error/androidruntime(1036): @ android.app.activity.startactivityforresult(activity.java:2833) 01-14 11:30:14.850: error/androidruntime(1036): @ com.litvin.app.ui.callingactivity.onsharedpreferencechanged(callingactivity.java:109 ) ...

whenever move home , launcher intent filters .ui.calledactivity, works fine. starts calledactivity when press icon.

i have looked through many similar answers here, none worked me.

// no need create object

calledactivity calledactivity = new calledactivity(); //comment line

//do this

intent.startactivityforresult(intent, called_activity_code);

android