Summary of several methods of Android exit program _android

The Android program has a lot of activity, such as the main window A, which calls the Sub window B, and if you finish directly in B (), then it shows a. How do you close the entire Android application in B? I have summed up several relatively simple implementation methods.
1. Local method of Dalvik VM

Copy Code code as follows:

Android.os.Process.killProcess (Android.os.Process.myPid ())//Get PID
System.exit (0); Normal Java, C # Standard Exit method, the return value of 0 represents a graceful exit

2. Task Manager method
The first thing to say is that the method runs at more than 3 of the Android 1.5 API level, and requires permissions

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Activitymanager am = (activitymanager) getsystemservice (Context.activity_service);
Am.restartpackage (Getpackagename ());

The system will, under the package, all processes, services, all killed, you can kill clean, to note that plus permissions Android.permission.RESTART_PACKAGES

3. According to the statement cycle of the activity
3. We know that the Android window class provides a history stack, which we can use to skillfully implement the stack principle, where we add the logo intent.flag_activity_clear_top directly to the Intent when we open the B window in window A. By opening B, all activity in the process space will be cleared.
Use the following code in window A to invoke the b window

Copy Code code as follows:

Intent Intent = new Intent ();
Intent.setclass (Android123.this, Cwj.class);
Intent.setflags (Intent.flag_activity_clear_top); Note the flag setting of the bank
StartActivity (Intent);

Next in the b window you need to exit the direct use of the finish method to exit all.

4. Customize a actiivty stack, the same as above, but using a single case mode of the activity stack to manage all activity. and provide a way to quit all activity. The code is as follows:

Copy Code code as follows:

public class Screenmanager {
private static Stack Activitystack;
private static Screenmanager instance;
Private Screenmanager () {
}
public static Screenmanager Getscreenmanager () {
Instance=new Screenmanager ();
}
return instance;
}
Exiting the top of the stack activity
public void popactivity (activity activity) {
Activity.finish ();
Activitystack.remove (activity);
Activity=null;
}
}
Get current stack top activity
Public activity currentactivity () {
Activity activity=activitystack.lastelement ();
return activity;
}
Push the current activity into the stack
public void pushactivity (activity activity) {
Activitystack=new Stack ();
}
Activitystack.add (activity);
}
Exits all activity on the stack
public void Popallactivityexceptone (Class cls) {
while (true) {
Activity activity=currentactivity ();
Break
}
Break
}
Popactivity (activity);
}
}
}