1.首先我们的目的是长期监听时间变化，其实应用程序退出。
通过了解我们知道注册ACTION_TIME_TICK广播接收器可以监听系统事件改变，但是
查看SDK发现ACTION_TIME_TICK广播事件只能动态注册：
Broadcast Action: The current time has changed. Sent every minute. You can not receive this through components declared in manifests, only by exlicitly registering for it with Context.registerReceiver().
所以要想实现长期监听时间变化，就需要借助后台服务的帮助了
2.解决方法（3步骤）：
（1）在某个时间启动后台服务
package com.example.broadcastreceiverofdatachange;
import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
public class MainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//启动后台服务
Intent service=new Intent(this, TimeService.class);
startService(service);
}
}
（2）在服务组件中动态注册广播事件
package com.example.broadcastreceiverofdatachange;
import android.app.Service;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.IBinder;
import android.util.Log;
public class TimeService extends Service {
@Override
public IBinder onBind(Intent intent) {
return null;
}
@Override
public void onCreate() {
super.onCreate();
Log.i("liujun", "后台进程被创建。。。");
//服务启动广播接收器，使得广播接收器可以在程序退出后在后天继续执行，接收系统时间变更广播事件
DataChangeReceiver receiver=new DataChangeReceiver();
registerReceiver(receiver,new IntentFilter(Intent.ACTION_TIME_TICK));
}
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
Log.i("liujun", "后台进程。。。");
return super.onStartCommand(intent, flags, startId);
}
@Override
public void onDestroy() {
Log.i("liujun", "后台进程被销毁了。。。");
super.onDestroy();
}
}
（3）在广播接收器组件中操作
package com.example.broadcastreceiverofdatachange;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.util.Log;
public class DataChangeReceiver extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent) {
Log.i("liujun", "时间发生变化。。。");
}
}
//至此长期实现后台监听时间变化Demo就完成了。。。