android - Lollipop : Get top activity name

Question

如何获取 Lollipop 中的顶级 Activity 名称？

((ActivityManager)getSystemService(Context.ACTIVITY_SERVICE)).
   getRunningTasks(1).get(0).topActivity

不再适用于 Lollipop:

     * @deprecated As of {@link android.os.Build.VERSION_CODES#LOLLIPOP}, this method
     * is no longer available to third party
     * applications: the introduction of document-centric recents means
     * it can leak person information to the caller.  For backwards compatibility,
     * it will still retu rn a small subset of its data: at least the caller's
     * own tasks, and possibly some other tasks
     * such as home that are known to not be sensitive.

从 MyActivity 中的 onResume 调用

MyApplication.getInstance().saveCurentActivity(MyActivity.this)
saveCurentActivity(Activity a) {
    this.activityName = a.getClass().getSimpleName();
}

这不是一个好主意，因为 MyApplication 可能会因错误而被销毁(例如，NPE)。

Answer 1

这段代码对我有用。

ActivityManager activityManager = (ActivityManager)    context.getSystemService(Activity.ACTIVITY_SERVICE);
List<ActivityManager.RunningTaskInfo> taskInfo = activityManager.getRunningTasks(1);
String currentTopActivity = taskInfo.get(0).topActivity.getClassName();

它将提供 TopActivity。