Prevent the back button in the login activity

Question

I have an activity named MainActivity and another called LoginActivity. The main activity cannot be visible to logged out users. In the onCreate method of MainAcitivity I verifiy if the user is logged out and then I create the LoginActivity.

The problem is that if the user press the back button of the cellphone, the app go back to the MainActivity.

How I prevent this?

The code of the LoginAcitivity creation is this:

Intent i = new Intent(_context, LoginActivity.class);

i.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);         

i.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);

_context.startActivity(i);

check for the login in the onResume of your mainActivity, or in onActivityForResult. — njzk2, Jan 30 '14 at 18:07

score 6 · Accepted Answer · answered Jan 30 '14 at 18:11

6

You can call finish(); just after startActivity(). This will kill MainActivity so the back button will close the app.

answered Jan 30 '14 at 18:11

Jon Ander Peñalba

549
3
11

Thanks! Works fine like I want =D – Renan Cunha Jan 30 '14 at 18:26

score 3 · Answer 2 · answered Jan 30 '14 at 18:11

3

after: _context.startActivity(i);

put: finish();

answered Jan 30 '14 at 18:11

wernerH

33
6

score 2 · Answer 3 · edited May 23 '17 at 12:00

2

If you're fine with just disabling the back button in the LogInActivity, you can do so with the following code in the LogInActivity class:

@Override
public void onBackPressed() {
}

Taken from here

edited May 23 '17 at 12:00

Community

1
1

answered Jan 30 '14 at 18:11

aProperFox

2,114
2
20
21

score 0 · Answer 4 · answered Jul 24 '19 at 10:50

AndroidManifest.xml

<activity
    android:noHistory="true"
    android:name=".activity.MainActivity"
    android:screenOrientation="portrait"
    android:label="@string/title_activity_maps">
    <intent-filter>
        <action android:name="android.intent.action.MAIN" />
        <category android:name="android.intent.category.LAUNCHER" />
    </intent-filter>
</activity>

<activity
    android:noHistory="true"
    android:screenOrientation="portrait"
    android:windowSoftInputMode="adjustResize"
    android:name=".activity.LoginActivity" />

I tried "noHistory" in the file "AndroidManifest.xml". Main- and LoginActivity. Works so far in my app.

"Back-Button" terminates the app in Login- and MainActivity

Prevent the back button in the login activity

4 Answers4