finish() finish the activity but it is still on background

Question

I have a question concerning the finish() method of an activity in android studio:

I have this simple code:

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        findViewById(R.id.button).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                finish();
            }
        });
    }
}

In my activity_main I simply have a button. When I click on the button the activity finishes and I go back to the main screen of the device...However, when I click on the menu button of the device (which shows all the app running in background) I still see my activity... and I do not want that. How can I fix it?

Answer 1

try using

android:excludeFromRecents="true" in your Activity in AndroidManifest.xml.

<activity
            ...
             android:excludeFromRecents="true">
</activity>

Answer 2

if the activity has a thread running in the background to download data from the network, it may create that thread in onCreate() and then stop the thread here in onDestroy() if you don't have new thread you can after finish(); write return;