Android应用前后台监听最简单的方法

public class IsForeBackGroundActivityCallback implements ActivityLifecycleCallbacks {    private int foregroundActivities = 0;    private boolean isbackGroudAcitvity;    @Override    public void onActivityCreated(Activity activity, Bundle bundle) {        if (bundle != null) { // 若bundle不为空则程序异常结束            // 重启整个程序            Intent intent = new Intent(activity, SplashActivity.class);            intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK );            startActivity(intent);        }    }    @Override    public void onActivityStarted(Activity activity) {        LogUtils.e("栈顶的activity======"+activity);        foregroundActivities++;        if (foregroundActivities == 1 && !isChangingConfiguration) {            // 应用切到前台                       LogUtils.e("应用切换到前台");                isbackGroudAcitvity= false;    }    @Override    public void onActivityResumed(Activity activity) {    }    @Override    public void onActivityPaused(Activity activity) {    }    @Override    public void onActivityStopped(Activity activity) {        foregroundActivities--;        if (foregroundActivities == 0) {            // 应用切到后台            LogUtils.e("应用切换到后台");                         isbackGroudAcitvity= activity.isChangingConfigurations();    }    @Override    public void onActivitySaveInstanceState(Activity activity, Bundle bundle) {    }    @Override    public void onActivityDestroyed(Activity activity) {    }}

废话不多说，直接使用：在Application 的onCreate方法注册：

registerActivityLifecycleCallbacks(new IsForeBackGroundActivityCallback ());

就这么简单。

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