finish() is closing two activities instead one

Question

I've made an app that does the following:

activity A --> activity B --> activity C

activity A --> activity B2 --> activity C

When you close B, B2 or C, it goes to the previous activity. If you close A, it exits from the app.

If you arrive to C from B, C works in one way, but if you arrive from B2, C works in a bit different way.

This works perfectly in emulator and all devices that I could check, but a problem has appeared in two Xperia (models ARC & U) with android 4.0.4.

The problem appers when they arrive to C from B. When they close C they go back to A instead to B. If they arrive to C from B2, when they close go back to B2.

I can't understand that. It's supposed that C had to work in the same way in both cases.

And the other question is: How is possible that the app works perfectly in all devices except this two?

Any idea? How can I solve this problem?

Editing to add code:

Opening C from B:

public void onItemClick(AdapterView<?> parent, View v, int position, long id) {
    // TODO Auto-generated method stub
    switch (position+1) {
    case 1:
        if(random == true){
            AnimalsBD.cmpt = Integer.parseInt(ABD.getNAct(Integer.toString(Aguila.ordre)))+1;
            }
        Intent a = new Intent ("com.android.JIA.Animals.1");
        startActivity(a);
    break;
    case 2:
        if(random == true){
            AnimalsBD.cmpt = Integer.parseInt(ABD.getNAct(Integer.toString(Anec.ordre)))+1;
            }
        Intent b = new Intent ("com.android.JIA.Animals.2");
        startActivity(b);
    break;

Opening C from B2:

public void onItemClick(AdapterView<?> parent, View v, int position, long id) {     
    // TODO Auto-generated method stub

    mpCorrecte = MediaPlayer.create(this, R.raw.correcte);
    mpIncorrecte = MediaPlayer.create(this, R.raw.incorrecte);

    if(start){
    switch (position+1) {
    case 1:
        if(numSo==1){
            start = false;
            mpCorrecte.start();
            mpCorrecte.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {
                public void onCompletion(MediaPlayer mp) {
                    Intent a = new Intent ("com.android.JIA.Animals.1");
                    startActivity(a);}                  
            });
        }else{
            mpIncorrecte.start();
        }
    break;
    case 2:
        if(numSo==2){
            start = false;
            mpCorrecte.start();
            mpCorrecte.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {
                public void onCompletion(MediaPlayer mp) {
                    Intent a = new Intent ("com.android.JIA.Animals.2");
                    startActivity(a);}                  
            });
        }else{
            mpIncorrecte.start();
        }
    break;

In both cases I'm opening a final activity from a gridview. All the final activities works equally.

Thank you.

Answer 1

Finally, I've could solve the problem.

There was a finish() lost in the OnDestroy() method like this:

@Override
protected void onDestroy() {
    // TODO Auto-generated method stub
    super.onDestroy();
    ABD.erase();
            finish();
}   

Thank you for your help.

Now the question is: why this finish() didn't do anything in any device except in these two models?

Unsolved mistery...

Answer 2

Use this code to open new activity.

        Intent i = new Intent(CurrentActivity.this,
            OpeningActivity.class);
    startActivity(i);

Replace CurrentActivity and OpeningActivity

How is possible that the app works perfectly in all devices except this two?
You have to check it manually by selecting different types phones like different platform , different screen size and different specification .