获取应用当前activity

获取应用当前activity

1、获取权限

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

2、调用方法

public void getTopActivityName() {
        String topActivityClassName = null;

        ActivityManager activityManager = (ActivityManager) (getApplicationContext().getSystemService(Context.ACTIVITY_SERVICE));
        List<ActivityManager.RunningTaskInfo> runningTaskInfos = activityManager.getRunningTasks(1);
        if (runningTaskInfos != null) {
            ComponentName f1 = runningTaskInfos.get(0).topActivity;
            topActivityClassName = f1.getClassName();
            Log.v("topActivityClassName" , topActivityClassName);
            Log.v("numActivities" , ""+runningTaskInfos.get(0).numActivities);
        }
    }

注意：
Android 5.0在API权限上作了修改

Android L,Google has disabled getRunningTasks. Now it can only return own apps task and the home launcher.

也就是说只能获取当前应用的活动类名，当前应用，当前应用。