Android Activity onCreate Being Called Twice When Navigated Back From Another Activity

Question

I have an app that generates music after a user authenticates with OAuth on a webview activity, looking something like this: main player activity-OAuth Activity-back to main player activity. However, the onCreate method is being called twice when going from the OAuth activity, resulting in two audio tracks generated and played at the same time. Here's part of the code from the MainActivity: ``` public class MainActivity extends Activity { int pitch=60; private static final float VISUALIZER_HEIGHT_DIP = 50f; Random rn; boolean isRunning = true; boolean isPlaying=false; SeekBar fSlider; double sliderval; MediaPlayer mediaPlayer=new MediaPlayer(); ImageButton startStopButton; ImageButton stopButton; SeekBar vSlider; VisualizerView mVisualizerView; private Visualizer mVisualizer; ImageButton connectButton; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); // point the slider to the GUI widget rn = new Ra…

Accepted Answer

There seems to be a mistake in your implementation. The thing is, you are trying to use an Intent object to navigate back to your MainActivity form WebActvitity. This is a problem. You shouldn't be doing that.

Whenever you wanna move back to your previous activity, you should simply be calling finish() in the current Activity.

In our scenario,the by using Intent in your WebActivity you are creating a new instance for your MainActivity which already exists in the stack(background). Simply calling finish() in the WebActivity should close it and your MainActivity should be visible.

Do the following changes,

```
@Override
protected void onPostExecute(String result) {       
    super.onPostExecute(result);
    Log.d("Post result", result);
    Intent intent = new Intent(getApplicationContext(), MainActivity.class);
    startActivity(intent);
}
```

Replace the above method like this,

```
@Override
protected void onPostExecute(String result) {       
    super.onPostExecute(result);
    Log.d("Post result", result);
    finish();
}
```

Android Activity onCreate Being Called Twice When Navigated Back From Another Activity

Solution

Problem