onresume - 安卓: "Application level"暂停和恢复

Question

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Answer 1

该问题的另一种解决方案是仅跟踪每个 Activity 的 onStart() 和 onStop() 调用次数。示例:

首先，创建一个类来保存计数:

public class ActiveActivitiesTracker {
    private static int sActiveActivities = 0;

    public static void activityStarted()
    {
        if( sActiveActivities == 0 )
        {
            // TODO: Here is presumably "application level" resume
        }
        sActiveActivities++;
    }

    public static void activityStopped()
    {
        sActiveActivities--;
        if( sActiveActivities == 0 )
        {
            // TODO: Here is presumably "application level" pause
        }
    }
}

然后在每个 Activity 中，只需调用 activityStarted() 和 activityStopped() 方法:

@Override
public void onStart() {
    super.onStart();
    ActiveActivitiesTracker.activityStarted();
}

@Override
public void onStop() {
    super.onStop();
    ActiveActivitiesTracker.activityStopped();
}