Closing previous Activity in Android

Question

I am new to android and trying my level best.

I am having an application with three activities, 1 login page 2. Home page 3. Registration Page

The first activity loaded is login when a user gives correct user name and password I am allowing to Home page Here I am facing a problem, when I click back button I am going to the login screen again it should not happen the application has to close.

while creating intent and loading home activity i am using finish() also

I tried onBackPressed() method but it does not work for me

    public void onBackPressed() {
              //      HomeActivity.this.finish();
                      super.onBackPressed();
      }

And my manifest file is

        <?xml version="1.0" encoding="utf-8"?>
        <manifest xmlns:android="http://schemas.android.com/apk/res/android"
        package="com.Example.MyProject">
        <application
        android:name=".MyApplication"
        android:allowBackup="true"
        android:hardwareAccelerated="false"
        android:icon="@drawable/abc"
        android:label="@string/app_name_display"
        android:supportsRtl="true"
        android:largeHeap="true"
       android:manageSpaceActivity=".LoginActivity"
       android:theme="@style/AppTheme">
       <activity android:name=".LoginActivity">
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>
    <service android:name=".SyncData" >
    </service>
    <activity android:name=".HomeActivity"
        android:screenOrientation="portrait"/>
       <activity android:name=".Registration"  />
       </application>

      </manifest>

When you launch `Home` from `Login` do you also call `finish()`? If so, pressing BACK in `Login` should NOT return to `Home`. Add your manifest to your question please — David Wasser, Dec 09 '16 at 12:34
yes i am calling but after logout also when i press back button it is loading home screen — Nitesh, Dec 09 '16 at 12:38
That is not standard Android behaviour. You may be seeing this nasty Android bug: http://stackoverflow.com/a/16447508/769265 Please force stop your app and then start it again from the HOME screen. Then login and press the BACK button and see if your `HomeActivity` still shows. — David Wasser, Dec 09 '16 at 13:42
@DavidWasser, you are correct, Thank you for your helpful link — Nitesh, Dec 10 '16 at 05:48
Sorry about that. A lot of people have been bitten by this bug :-( — David Wasser, Dec 10 '16 at 06:55

score 2 · Answer 1 · edited Dec 09 '16 at 10:59

2

Intent intent = new Intent(LoginActivity.this, HomeActivity.class);

startActivity(intent);
finish();

finish() will destroy your Login activity once you reach to HomeActivity.java and you wont reach to LoginActivity again.

edited Dec 09 '16 at 10:59

Harshad Pansuriya

20,189
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answered Dec 09 '16 at 10:53

Sandip Lawate

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startActivity(new Intent(context, HomeActivity.class)); finish(); – Nitesh Dec 09 '16 at 11:15
@A.Nitesh Don't use this in your `onBackPressed`, instead use it when you redirect your user to the `HomeActivity` – Ali Bdeir Dec 09 '16 at 11:23
yes When i i am starting new activity i will close old activity buy calling finish() – Nitesh Dec 09 '16 at 11:34
in onBackPressed() method i am using just super.onBackPressed(); – Nitesh Dec 09 '16 at 11:34
Dont overrride onBackpressed() in HomeActivity.java . just delete that code. – Sandip Lawate Dec 09 '16 at 11:41
1

@Sandiskp then how to handle this issue with out backpress – Nitesh Dec 09 '16 at 11:44
@A.Nitesh Once you reach to HomeActivity by above code. What happens when you delete that backpress method and press android backbutton ? – Sandip Lawate Dec 09 '16 at 11:47
on back press i need to close the application if that activity is home else normal back functionality – Nitesh Dec 09 '16 at 11:51
You are on HomeActivity, Once you press back from home activity , Your application will get closed. If you are on Registration page you will come on home Activity and then back press will close the application. – Sandip Lawate Dec 09 '16 at 12:19
@Sandiskp that is the exact scenario i want but its not working like that – Nitesh Dec 09 '16 at 12:25

Rajakumar · Answer 2 · 2016-12-09T12:07:27.577

0

Try this one..

 private Boolean exit = false;

   @Override
    public void onBackPressed() {
        // TODO Auto-generated method stub
        if (exit) {
            Intent intent = new Intent(Intent.ACTION_MAIN);
            intent.addCategory(Intent.CATEGORY_HOME);
            intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
            intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK);
            startActivity(intent);
            finish();
        } else {
            Toast.makeText(this, "Tap again to exit.", Toast.LENGTH_SHORT)
                    .show();
            exit = true;

    }
}

edited Dec 09 '16 at 12:07

answered Dec 09 '16 at 10:50

Rajakumar

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7
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In normal cases its works fine, but in my allocation having some scenarios like, while logout i am asking wheatherhe want to log out (Yes/no) if user clicks yes then logout is processed here when i pressed back agian is is going to home screen – Nitesh Dec 09 '16 at 11:16

SWAT · Answer 3 · 2016-12-09T12:11:31.977

0

Just Override your onBackPressed on the second Activity and do not call

super.onBackPressed();

For instance,Override your onBackPressed like this:

@Override
public void onBackPressed() {
//Do something else here, maybe prompt the user if he needs to exit the app.
finishAffinity();;//If you want to close the application.
}

I would add something like this, to be user friendly

@Override
public void onBackPressed() {
android.support.v7.app.AlertDialog.Builder alertDialogBuilder = new android.support.v7.app.AlertDialog.Builder(this);
        alertDialogBuilder.setMessage("Do you wish to exit the app?");

        alertDialogBuilder.setPositiveButton("No", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int arg1) {
                dialog.dismiss();
            }
        });

        alertDialogBuilder.setNegativeButton("Yes", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                finishAffinity();
            }
        });

        android.support.v7.app.AlertDialog alertDialog = alertDialogBuilder.create();
        alertDialog.show();
    }

edited Dec 09 '16 at 12:11

answered Dec 09 '16 at 11:32

SWAT

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8
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If we do like this back press button itself will not work – Nitesh Dec 09 '16 at 11:38
its not my requirment – Nitesh Dec 09 '16 at 11:39
Nitesh, as I understand from the question, the back is not supposed to work. – SWAT Dec 09 '16 at 11:43
no no, the back button should not lead us to login activity, consider a example like for facebook if we login once, the application will open and while closing the application it will not lead to login page na – Nitesh Dec 09 '16 at 11:48
I am not concern about alert messages and their functionallity, here the major problem is onBackPressed i am going to previous activity that should not happen. For ur clear understanding i will tell you one thing. After Logout when i press back button it is going to launch home activity – Nitesh Dec 09 '16 at 11:56
You can use finishAffinity(); – SWAT Dec 09 '16 at 12:12
It will close whole application – Nitesh Dec 09 '16 at 12:26
Please rephrase the question if you need a valid response. "I am going to the login screen again it should not happen the application has to close." This is what you asked, that is what I replied for. – SWAT Dec 09 '16 at 14:32

score 0 · Answer 4 · edited May 23 '17 at 11:54

0

Another user bitten by this nasty long-standing Android bug.

If I had a dollar for every hour that was spent by software developers trying to figure this out, I wouldn't have to work anymore.

Google: FIX IT!

edited May 23 '17 at 11:54

Community

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answered Dec 11 '16 at 11:24

David Wasser

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Closing previous Activity in Android

4 Answers4