android 监听应用前后台运行状态

首先此文章适用于API14及以上。
1.建立Application extends Application
2. 在onCreate方法中：

public int count = 0;
@Override
public void onCreate() {
super.onCreate();
context = getApplicationContext();

    /*    此监听为监控应用是否在前后台     */    registerActivityLifecycleCallbacks(new ActivityLifecycleCallbacks() {        @Override        public void onActivityCreated(Activity activity, Bundle savedInstanceState) {        }        @Override        public void onActivityStarted(Activity activity) {            if (count == 0) {                //Log.v("tag", ">>>>>>>>>>>>>>>>>>>切到前台  lifecycle");                // 首先计算时间 网络请求判断是否进入手势密码验证界面                Log.v("cjq", ">>>>>>>>>>>>>>>>>>>切到前台  lifecycle");

//
// Date date2 = new Date();
// returnTime = date2.getTime();
// double sub = BigDecimalUtils.sub2(new BigDecimal(returnTime), new BigDecimal(time));
// if (sub >= 300000d) {
// //判断进入解锁手势密码
// } else {
// time = -1;
// }

            }            count++;             Log.v("cjq", ">>>>>>>>>>>>>>>>>>>切到前台  lifecycle    "+count);        }        @Override        public void onActivitySaveInstanceState(Activity activity, Bundle outState) {        }        @Override        public void onActivityResumed(Activity activity) {        }        @Override        public void onActivityPaused(Activity activity) {        }        @Override        public void onActivityStopped(Activity activity) {            count--;

// if (count == 0) {
// Log.v(“tag”, “>>>>>>>>>>>>>>>>>>>切到后台 lifecycle”);
// date = new Date();
// time = date.getTime();
// } else {
// time = -1;
// }
Log.v(“tag”, “>>>>>>>>>>>>>>>>>>>切到后台 lifecycle “+count);
}

        @Override        public void onActivityDestroyed(Activity activity) {            Log.v("tag", ">>>>>>>>>>>>>>>>>>>杀死  lifecycle   "+count);        }    });}

“`

注解：应用开始时count为0；
onActivityStarted方法监听activity启动启动一个 count+1；
onActivityStopped方法监听activity停止也就是置于后台或杀死。count-1；
当count为0是说明是置于后台状态或退出应用*这里写代码片*

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