Android Timer的使用

1：服务端使用PHP

<?phpecho date('Y-m-d H:i:s');
?>

2：activity_main.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"xmlns:tools="http://schemas.android.com/tools"android:layout_width="match_parent"android:layout_height="match_parent"><Button android:id="@+id/btn_click"android:layout_width="match_parent"android:layout_height="wrap_content"android:text="Button Start"/><TextViewandroid:id="@+id/tv_show"android:layout_below="@id/btn_click"android:layout_width="wrap_content"android:layout_height="wrap_content"android:text="@string/hello_world" android:textSize="28sp"/><Button android:id="@+id/btn_stop"android:layout_below="@id/tv_show"android:layout_width="match_parent"android:layout_height="wrap_content"android:text="Button Stop"/></RelativeLayout>

3:MainActivity.java

HttpHelper.getStringFromNet2(param)此方法见：http://www.cnblogs.com/yshyee/p/3370147.html

public class MainActivity extends Activity {private Button btnClick=null;private Button btnStop=null;private TextView tvShow=null;private String info="";private Timer timer=null;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);btnClick=(Button)findViewById(R.id.btn_click);btnStop=(Button)findViewById(R.id.btn_stop);tvShow=(TextView)findViewById(R.id.tv_show);timer=new Timer();btnClick.setOnClickListener(new OnClickListener(){public void onClick(View view){timer.scheduleAtFixedRate(new MyTask(), 100, 2000);}});btnStop.setOnClickListener(new OnClickListener(){public void onClick(View view){timer.cancel();}});}Handler myHandler=new Handler(){public void handleMessage(Message msg){if(info!=""){tvShow.setText(info);}}};private class MyTask extends TimerTask{public void run(){String param="http://192.168.0.116/android/time.php";info=HttpHelper.getStringFromNet2(param);myHandler.obtainMessage(100).sendToTarget();}}
}

4:运行结果：