ActivityManager manager = (ActivityManager) getSystemService(Context.ACTIVITY_SERVICE);
RunningTaskInfo info = manager.getRunningTasks(1).get(0); //获得信息
String shortClassName = info.topActivity.getShortClassName(); //类名
String className = info.topActivity.getClassName(); //完整类名
String packageName = info.topActivity.getPackageName(); //包名
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