无法杀死另一个Android应用程序

Question

我正试图从另一个应用程序中杀死另一个android进程（app）。但我无法这样做..

private boolean isReaderAppRunning() {
    ActivityManager activityManager = (ActivityManager)this.getSystemService(ACTIVITY_SERVICE);
    List<RunningAppProcessInfo> procInfos = activityManager.getRunningAppProcesses();
    boolean isFound = false;
    for(int i = 0; i < procInfos.size(); i++){
        Log.e("SSSSSSS NAMEEEEE", procInfos.get(i).processName);
        if(procInfos.get(i).processName.equals("com.bosch.bst_acp")) {
            int pid = android.os.Process.getUidForName("com.bosch.bst_acp");
            android.os.Process.killProcess(pid);
            activityManager.killBackgroundProcesses("com.bosch.bst_acp");
            isFound = true;
        }
    }
    return isFound;

}

即使添加了权限，我也将pid设为-1。谁能告诉我我做错了什么？

<uses-permission android:name="android.permission.GET_TASKS"></uses-permission>