Question

Edit: the answer is not to call startActivityForResult on the called Activity object, instead invoke it from the caller’s context.

This is my code, exception on last 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):     at android.app.Activity.startActivityForResult(Activity.java:2833)
01-14 11:30:14.850: ERROR/AndroidRuntime(1036):     at com.litvin.app.ui.CallingActivity.onSharedPreferenceChanged(CallingActivity.java:109    )
...

Whenever I move the HOME and LAUNCHER intent filters into .ui.CalledActivity, it works fine. It starts CalledActivity when I press the icon.

I have looked through many similar answers here, but none worked for me.

Answer 1

// no need to create any object for that

CalledActivity calledActivity = new CalledActivity(); //comment this line

//do this

intent.startActivityForResult(intent, CALLED_ACTIVITY_CODE);