Question

I’m writing simple APN toggle app. I wanted to ask how to force android not show any window.
Currently after running my app, for brief time Black screen with app name is shown and then disappears.
Is it possible not to show anything ( only Toast message ) ?

public class ApnSwtichActivity extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    if (toggleAPN()){
       Toast.makeText(this, "Apn switched", Toast.LENGTH_SHORT).show();
    }
    this.finish();
}}

Answer 1

Sounds like you want an activity without a UI
How to launch an Activity without a UI?

You’ll probably want to use

android:theme="@android:style/Theme.NoDisplay"