android getRunningAppProcesses 总是返回 null
我有：-
Class Abc extends Activity(){
private ActivityManager am;
private List<RunningAppProcessInfo> rList;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
}
@Override
public void onStart (Bundle savedInstanceState) {
super.onStart(savedInstanceState);
}
@Override
public boolean onTouchEvent(MotionEvent event) {
super.onTouchEvent(event);
rList= am.getRunningAppProcesses();
Log.e("MAIN", rList.isEmpty() +" .");
return true;
}
}
am.getRunningAppProcesses() 始终 null 即使我有前台应用程序正在运行，活动应用程序也会正确显示它们。我知道如果没有其他程序运行，它应该返回 null，但我启动了其他应用程序（gmail、相机，用于测试）
这是权限问题吗？
I have :-
Class Abc extends Activity(){
private ActivityManager am;
private List<RunningAppProcessInfo> rList;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
}
@Override
public void onStart (Bundle savedInstanceState) {
super.onStart(savedInstanceState);
}
@Override
public boolean onTouchEvent(MotionEvent event) {
super.onTouchEvent(event);
rList= am.getRunningAppProcesses();
Log.e("MAIN", rList.isEmpty() +" .");
return true;
}
}
am.getRunningAppProcesses() is always null even though i have foreground apps running, the active applications also shows them correctly. i know that its supposed to return null if there's nothing else running, but i launch other apps (gmail, camera, for testing)
Is this a permissions issue?
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想通了。
对于
ActivityManager am，由于构造函数是private，并且没有可用的static实例，因此必须将其实例化，如下所示：am = ( ActivityManager)getSystemService(ACTIVITY_SERVICE);希望这对遇到类似问题的人有用
figured it out.
For
ActivityManager am, since the constructor isprivate, and nostaticinstances are available, it must be instantiated like:am = (ActivityManager)getSystemService(ACTIVITY_SERVICE);Hope this is useful to someone stuck with a similar problem