I want to finish activity from other activity

Question

There are three activities: A, B, C;

A, B are normal activities, C is transparent activity to show a kind of guide.

I programmed when I go B from A, C starts automatically on B.

The problem is when I instantly press back button at when B starts,

C shows up on A.

I want to solve this problem, please help.

Answer 1

You could inside activity B

@Override
public void onBackPressed() {
     // Here finish activity C
     super.onBackPressed();
}

Other solution: Keep a public reference to Activity C

1. In the manifest.xml set Activity C launchMode = "singleInstance"
2. Inside Activity C:

public static Activity activity;
onCreate(){
    activity = this;
}

3. Finish it from any activity:

if(ActivityC.activity != null) {
    ActivityC.activity.finish();
}