Question

Is there any way to control the previous activity when the user presses the back button on the device.

Controlling it by setting a TextView to clear when the user does or ending the previous activity.

Thanks

Answer 1

Of course! Android provides some build in methods that are invoked when events (like pressing the back button and going to a previous activity) take place. These methods are detailed in the Android Activity life cycle.

One way to solve your problem would be by using the onResume method. Inside this method you can set your TextView to whatever you want once the activity is resumed.

protected void onResume() {
    super.onResume();
    //now perform any operations on your textview
    //for example
    fooTextView.setText("I resumed my activity");
}

One side note, is this code will get fired as the user starts the Activity for the first time. You may need to prevent this happening via a boolean value or use an alternative method to solve your problem like the method onActivityResult if you feel it is appropriate.