CODEWITHSUNDEEP
androidandroid-activityandroid-lifecycle
Chris
Chris

Reputation: 6301

Android: Previous activity returns on back button press after finish()

I have 2 activities. The first activity is the LogoActivity. After 3 seconds I start the second activity that is my MainActivity.

private void startCountDown(int duration, int interval) {
    CountDownTimer mCountDownTimer = new CountDownTimer(duration, interval) {
        @Override
        public void onTick(long millisUntilFinished) {
            // nothing
        }

        @Override
        public void onFinish() {
            startActivity(MainActivity.class);
            finish();
        }
    };

    mCountDownTimer.start();
}

startActivity(Class mClass) is a method that I created to start any activity just by giving the class.

Now I am in the MainActivity. If I exit by pressing home button and return back I see the MainActivity, but if I press back button from MainActivity and reopen the app from background the LogoActivity show up first.

I dont want the users to see the LogoActivity everytime they press back button(button from phone, not activity) from MainActivity and restore it from background.

Why is the LogoActivity shown if I called finish()?

Upvotes: 0

Views: 3677

Answers (8)

IDontEvenKnow
IDontEvenKnow

Reputation: 122

Always use intent.addFlags(Intent.FLAG_ACTIVITY_REORDER_TO_FRONT);

Upvotes: 0

Ajitha
Ajitha

Reputation: 707

You can use activity attributes in manifest to achieve the same.

"android:finishOnTaskLaunch"

For more please visit http://developer.android.com/guide/topics/manifest/activity-element.html

Upvotes: 0

Navin Gupta
Navin Gupta

Reputation: 803

Why is the LogoActivity shown if I called finish()?

The answer is- When you start your application than your system checks app's ManifestFile to get An activity whose Intent-filter action and category is set to "android.intent.action.MAIN" and "android.intent.category.LAUNCHER" .

This activity is your app's launcher(first) activity. (I think ,In your case it is LogoActivty).

When you starts your app "Android system" adds this activity in your Activity stack.As you start some other activity that one also add to the top of Activity stack.

On finish an activity it will removed from Activity stack.

whenever you start your app "Android system" traces Activity stack to get top activty.And start your application from that one.

If it found Activity stack empty the system starts your app with your app's launcherActivity.

In your case you finishes both activities.Thus your Activity stack becomes empty and it start you app with LogoActivity.

SOLUTION

override onBackPress method in MainActivity and dont call finish. But In this case your Activity will not closed onbackPress.

Or make your MainActivity launcher activity

Upvotes: 1

Jorge Díaz
Jorge Díaz

Reputation: 1

Try to control the onBackPressed() method of your activity.

Upvotes: 0

Collins Abitekaniza
Collins Abitekaniza

Reputation: 4578

Try overiding onBackPressed() method

@Override
public void onBackPressed() {
    moveTaskToBack(true);
}

Upvotes: 0

Jaydip
Jaydip

Reputation: 651

You have to use Intent for new activity. Like this.

startActivity(new Intent(LogoActivity.this, MainActivity.class));
finish();

Instand of only startActivity(MainActivity.class)

Upvotes: -1

Eric Liu
Eric Liu

Reputation: 1536

When you press back button, the instance of MainActivity is destroyed.

And then you come back to this task stack again, the LogoActivity is your default Activity so the system creates one instance of it for you.

You can make the MainActivity the default Activity in manifest.xml

<activity android:name=".MainActivity" >
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>

And start LogoActivity in the onCreate method of MainActivity so the user will see LogoActivity first.

After 3 seconds, finish the LogoActivity.

Upvotes: 2

Alberto M&#233;ndez
Alberto M&#233;ndez

Reputation: 1064

Because it is different using Back vs Home button. See Android Activity lifecycle: http://developer.android.com/intl/es/reference/android/app/Activity.html

Upvotes: 0

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