android 前后台切换回调

最新推荐文章于 2022-10-02 17:12:45 发布

冫氵灬灬

最新推荐文章于 2022-10-02 17:12:45 发布

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分类专栏： java/android

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本文介绍两种检测Android应用前后台状态的方法。方法一通过实现Application.ActivityLifecycleCallbacks接口，在全局Application中监听所有Activity的生命周期变化来判断；方法二通过检查当前进程是否处于前台状态来判断应用是否处于前台。

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方法一：

public class MyApplication extends Application implements Application.ActivityLifecycleCallbacks {
    private String TAG="MyApplication";
    @Override
    public void onCreate() {
        super.onCreate();
        registerActivityLifecycleCallbacks(this);

    }
    public int count = 0;
    @Override
    public void onActivityStopped(Activity activity) {
        Log.v(TAG, activity + "onActivityStopped");
        count--;
        if (count == 0) {
            Log.v(TAG, "切到后台");
        }
    }

    @Override
    public void onActivityStarted(Activity activity) {
        Log.v(TAG, activity + "onActivityStarted");
        if (count == 0) {
            Log.v(TAG, "切到前台");
        }
        count++;
    }

    @Override
    public void onActivitySaveInstanceState(Activity activity, Bundle outState) {
        Log.v(TAG, activity + "onActivitySaveInstanceState");
    }

    @Override
    public void onActivityResumed(Activity activity) {
        Log.v(TAG, activity + "onActivityResumed");
    }

    @Override
    public void onActivityPaused(Activity activity) {
        Log.v(TAG, activity + "onActivityPaused");
    }

    @Override
    public void onActivityDestroyed(Activity activity) {
        Log.v(TAG, activity + "onActivityDestroyed");
    }

    @Override
    public void onActivityCreated(Activity activity, Bundle savedInstanceState) {
        Log.v(TAG, activity + "onActivityCreated");
    }
}

方法二：

@Override
protected void onStart() {
    super.onStart();
    isCurrentRunningForeground = isRunningForeground(this);
    if (isCurrentRunningForeground) {
        Log.d(TAG, "切到前台 activity process");
    }
}

@Override
protected void onStop() {
    super.onStop();
    isCurrentRunningForeground = isRunningForeground(this);
    if (!isCurrentRunningForeground) {
        Log.d(TAG, "切到后台 activity process");
    }
}

public boolean isRunningForeground(Context context) {
    ActivityManager activityManager = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);
    List<ActivityManager.RunningAppProcessInfo> appProcessInfos = activityManager.getRunningAppProcesses();
    // 枚举进程
    for (ActivityManager.RunningAppProcessInfo appProcessInfo : appProcessInfos) {
        if (appProcessInfo.importance == ActivityManager.RunningAppProcessInfo.IMPORTANCE_FOREGROUND) {
            if (appProcessInfo.processName.equals(context.getApplicationInfo().processName)) {
                Log.d(TAG, "切到前台");
                return true;
            }
        }
    }
    Log.d(TAG, "切到后台");
    return false;
}