创建一个定时器定期发送HTTP请求-Android

Question

我想结束从Android设备到web服务器的HTTP请求，并定期（每分钟一次）检查数据库的特定数据。我无法为此实现计时器。

感谢

Answer 1

public class MyActivity extends Activity {
Timer t ;
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    t = new Timer();
    t.schedule(new TimerTask() {
        public void run() {

            //Your code will be here 
        }
      }, 1000);
   }
}

Answer 2

尝试运行Service的AlarmManager。我不建议你每分钟发送一次请求，除非它只在用户手动触发时发生。

Answer 3

TimerTask doAsynchronousTask;
final Handler handler = new Handler();
Timer timer = new Timer();
doAsynchronousTask = new TimerTask() {
    @Override
    public void run() {
        handler.post(new Runnable() {
            public void run() {
                 if(isOnline){// check net connection
                  //what u want to do....
                }
            }
        });
    }
};
timer.schedule(doAsynchronousTask, 0, 10000);// execute in every 10 s

Answer 4

最简单的方法是循环处理程序：

private Handler iSender = new Handler() { 
    @Override
    public void handleMessage(final Message msg) { 
        //Do your code here
        iSender.sendEmptyMessageDelayed(0, 60*1000);
    }
};

要开始循环，请调用以下句子：

    iSender.sendEmptyMessage(0);