Exit an android app

How t开发者_如何学Co close an android app if more than one activity is in active state?

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A blog post entitled Exiting Android Application will show how to exit an Android app:

When the user wishes to exit all open activities, they should press a button which loads the first Activity that runs when your app starts, in my case "LoginActivity".

    Intent intent = new Intent(getApplicationContext(), LoginActivity.class);
    intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
    intent.putExtra("EXIT", true);
    startActivity(intent);

The above code clears all the activities except for LoginActivity. LoginActivity is the first activity that is brought up when the user runs the program. Then put this code inside the LoginActivity's onCreate, to signal when it should self destruct when the 'Exit' message is passed.

    if (getIntent().getBooleanExtra("EXIT", false)) {
        finish();
    }

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I got an easy solution for this problem

From the activity you press the exit button go to the first activity using the following source code. Please read the documentation for FLAG_ACTIVITY_CLEAR_TOP also.

Intent intent = new Intent(ExitConfirmationActivity.this, FirstActivity.class);
            intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
            startActivity(intent);

Now overide onResume() of the first activity using finish()

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The answer is simple: You really do not need to 'close' an Android application. If no activity is shown any more, the system will kill the process after some time. The users can close activities by pressing the 'back' button. Reto Meier explains it pretty well here: http://blog.radioactiveyak.com/2010/05/when-to-include-exit-button-in-android.html

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You might also want to read this thread; it is very helpful to say the least: Quitting an Android application - Is it frowned upon?

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Well, you shouldn't close your applications, as the system manages that. Refer to the posts/topics in the other answers for more information.

However, if you really, really want to, you can still call System.exit (0); like in any other Java application.

EDIT

ActivityManager actmgr = (ActivityManager) this.getSystemService (Context.ACTIVITY_SERVICE);
actmgr.restartPackage ("com.android.your.package.name");

I remembered something. I was trying to use this code to restart my application, but it only managed to kill my app. You can try it and see if it works for you.

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I asked a similar question a couple of weeks back. Do go through the answers and comments for more perspective and possible solutions.

IMO quitting an application depends on what your application does and the user expectations. While I understand the rationale on not having a quit button I also do believe that it's a choice that the application designer has to make based on the situation.

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Once your last Activity looses focus, Android will unload your process according to the current system needs / free resources. You shouldn't really care about that - just use the lifecycle onStart, OnStop etc... to manage your state.

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If you want to exit from one Android activity, this will bring you back to the previous activity or another activity from a specific place in current activity.

finish();
System.exit(0);