Changing activities with intent does not work

Question

It should work but it does not. I have an application with some activities. In example activity A and B. Order is A ->(some operation)->B->(some operation)->A... I start a new activities in this way:

//onClick method in A Activity
public void goToB(View view) {
    Intent intent = new Intent(this,BActivity.class);
    startActivity(intent);
    finish();
}

//onClick method in B Activity
public void goToA(View view) {
    Intent intent = new Intent(this,AActivity.class);
    startActivity(intent);
    finish();
}

I want to finish previous activities, so this is not solution in my case. I checked some answers here, in stackoverflow but they does not help in here.

Logcat says:

java.lang.IllegalStateException: Could not execute method of the activity
    at some places
Caused by: java.lang.reflect.InvocationTargetException
    at some places
Caused by: java.lang.IndexOutOfBoundsException
    at some places

Has anyone an idea what I am doing wrong? I think it's quite simple thing to do, but maybe I am misunderstanding finish() or startActivity() methods.

EDIT: One thing I forgot: starting a new activity works "in forward", so from A->B. From B->A it crashes.

post the view-(or button) that you click to start activity.. i'm referring to xml — Elltz, Jan 04 '15 at 16:18
It's normal button with android:onClick="goToA" / "goToB" in this case. — Charliee, Jan 04 '15 at 16:51
Your posted code and error message have nothing to do with each other. — Chris Stratton, Jan 04 '15 at 17:34
Please post the complete stacktrace from your crash. And the relevant code where it crashes. — David Wasser, Jan 05 '15 at 13:22

score 1 · Answer 1 · edited May 23 '17 at 10:33

1

Instead of doing it that way, try doing it this way:

public void goToA(View view) {
    Intent intent = new Intent(this, AActvity.class);
    intent.setFlag(Intent.FLAG_ACTIVITY_CLEAR_TOP);
    startActivity(intent);
}

You can read about what the flag does here and here, but it'll get rid of the extra instances running once you change the activity.

However, I will mention that you must have other issues if you're getting OutOfBounds.

edited May 23 '17 at 10:33

Community

1
1

answered Jan 04 '15 at 15:56

Alex K

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This works even worse. There are still the same errors and 'back' button now works (I do not want it to work [of course I always can override it and write an empty method]). – Charliee Jan 04 '15 at 17:03
@Charliee you have other issues in your code then that aren't related to the "finish" stuff. – Alex K Jan 04 '15 at 17:07

score 0 · Answer 2 · answered Jan 04 '15 at 17:36

Assuming that can be done by Intent, better is use finish(); to return to A activity;

//onClick method in A Activity
public void goToB(View view) {
Intent intent = new Intent(this,BActivity.class);
startActivity(intent);

}

//onClick method in B Activity
public void goToA() {    
this.finish();
}

The stack you will have less space.

Changing activities with intent does not work

2 Answers2