判断当前应用是否在前台

来源：互联网发布：秋之风腊肠淘宝编辑：程序博客网时间：2024/06/06 01:50

从网上找到一个取巧的方法、但很好用：

public class MyLifecycleHandler implements Application.ActivityLifecycleCallbacks {    private static int resumed;    private static int paused;    private static int started;    private static int stopped;    @Override    public void onActivityCreated(Activity activity, Bundle savedInstanceState) {    }    @Override    public void onActivityStarted(Activity activity) {        ++started;    }    @Override    public void onActivityResumed(Activity activity) {        ++resumed;    }    @Override    public void onActivityPaused(Activity activity) {        ++paused;        android.util.Log.w("test", "application is in foreground: " + (resumed > paused));    }    @Override    public void onActivityStopped(Activity activity) {        ++stopped;        android.util.Log.w("test", "application is visible: " + (started > stopped));    }    @Override    public void onActivityDestroyed(Activity activity) {    }    @Override    public void onActivitySaveInstanceState(Activity activity, Bundle outState) {    }    public static boolean isApplicationVisible() {        return started > stopped;    }    public static boolean isApplicationInForeground() {        // 当所有 Activity 的状态中处于 resumed 的大于 paused 状态的，即可认为有Activity处于前台状态中        return resumed > paused;    }}

直接把代发复制到项目中，然后在app的aplication中oncreate（）方法中就ok了

registerActivityLifecycleCallbacks(new MyLifecycleHandler());

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