How to kill all running applications in android?

I want to kill all running applications in android. so for this tas开发者_运维百科k, I've implemented the following code. But it is not working. The app still remains running.

ActivityManager manager = (ActivityManager) getSystemService(ACTIVITY_SERVICE);
    for (RunningAppProcessInfo service : manager.getRunningAppProcesses()) {
    Log.i("process name " , service.processName);
    
    android.os.Process.killProcess(service.pid);
    }

So where did I make a mistake in the code?

• You can use Process.killProcess(int pid) to kill processes that have the same UID with your App.
• You can use ActivityManager.killBackgroundProcesses(String packageName),with KILL_BACKGROUND_PROCESSES permission in your manifest(for API >= 8) or ActivityManager.restartPackage (String packageName)(for API < 8) to kill specified process,except of forground process.

So if you would to kill all other processes when your program is foreground process,you would to use ActivityManager.killBackgroundProcesses or ActivityManager.restartPackage:

List<ApplicationInfo> packages;
    PackageManager pm;
    pm = getPackageManager();
    //get a list of installed apps.
    packages = pm.getInstalledApplications(0);

   ActivityManager mActivityManager = (ActivityManager)context.getSystemService(Context.ACTIVITY_SERVICE);
   String myPackage = getApplicationContext().getPackageName();
   for (ApplicationInfo packageInfo : packages) {
        if((packageInfo.flags & ApplicationInfo.FLAG_SYSTEM)==1)continue;
        if(packageInfo.packageName.equals(myPackage)) continue;
        mActivityManager.killBackgroundProcesses(packageInfo.packageName);
   }      

In above snippet code,each process will be killed unless it be process of your App or system process.
References:
How to close all active applications from my Android app?
How do task killers work?

You have another possibility if the device is rooted (has superuser rights).

You can invoke an external process that would use the su rights. But note that it's probably a bad design as Android OS should be the only one to kill processes.

try {
   Process rootProcess = Runtime.getRuntime().exec(new String[] { "su" });

   String command = "kill - 9 <pid>";

   BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(rootProcess.getOutputStream()), 2048);
   try {
      bw.write(command);
      bw.newLine();
      bw.flush();
   } catch (IOException e) {
    // Handle error
   }
} catch (Exception e) {
   e.printStackTrace();
   // Device not rooted!            
}

According to doc enter link description here

Note that, though this API allows us to request to kill any process based on its PID, the kernel will still impose standard restrictions on which PIDs you are actually able to kill. Typically this means only the process running the caller's packages/application and any additional processes created by that app

I test it, and it only kill process hosted my App.

Reflect to force stop

ActivityManager am = (ActivityManager) getSystemService(Context.ACTIVITY_SERVICE); Method method = Class.forName("android.app.ActivityManager").getMethod("forceStopPackage", String.class); method.invoke(am, pkgName);

You should add this system permission:

android.permission.FORCE_STOP_PACKAGES