Android利用Timer刷新时间

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随喜结佛缘

场景描述：

每隔一秒刷新一下布局中TextView的显示时间。

布局文件代码：

<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"    android:paddingBottom="@dimen/activity_vertical_margin"    android:paddingLeft="@dimen/activity_horizontal_margin"    android:paddingRight="@dimen/activity_horizontal_margin"    android:paddingTop="@dimen/activity_vertical_margin"    tools:context="com.example.timerefresh.MainActivity" >    <TextView        android:id="@+id/tv_time"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="@string/hello_world" /></RelativeLayout>

JAVA代码(利用Timer实现)：

package com.example.timerefresh;import java.text.SimpleDateFormat;import java.util.Date;import java.util.Timer;import java.util.TimerTask;import android.os.Bundle;import android.os.Handler;import android.os.Message;import android.support.v7.app.ActionBarActivity;import android.util.Log;import android.view.Menu;import android.view.MenuItem;import android.widget.TextView;public class MainActivity extends ActionBarActivity {public static final String TAG = "MainActivity";private TextView tvTime;//时间刷新记时器private Timer timeTimer;//时间记时器任务private TimerTask timeTimerTask;//消息助手private Handler messageHandler;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);tvTime = (TextView) findViewById(R.id.tv_time);messageHandler = new MessageHandler();initTimeTimer();}@Overridepublic boolean onCreateOptionsMenu(Menu menu) {// Inflate the menu; this adds items to the action bar if it is present.getMenuInflater().inflate(R.menu.main, menu);return true;}@Overridepublic boolean onOptionsItemSelected(MenuItem item) {// Handle action bar item clicks here. The action bar will// automatically handle clicks on the Home/Up button, so long// as you specify a parent activity in AndroidManifest.xml.int id = item.getItemId();if (id == R.id.action_settings) {return true;}return super.onOptionsItemSelected(item);}/** * 初始化时间计时器 */public void initTimeTimer() {timeTimer = new Timer(true);timeTimerTask = new TimeTimerTask();if (null != timeTimer) {timeTimer.schedule(timeTimerTask, 1 * 1000);}}/** * 取消时间计时器 */public void removeTimeTimerTask() {if (null != timeTimer && null != timeTimerTask) {timeTimerTask.cancel();}}/** * 时间刷新任务 */class TimeTimerTask extends TimerTask {@Overridepublic void run() {Message message = new Message();Bundle bundle = new Bundle();// 存放数据  SimpleDateFormat df = new SimpleDateFormat("HH:mm:ss");//设置日期格式String currencyTime = df.format(new Date());bundle.putString("currencyTime", currencyTime);message.setData(bundle);messageHandler.sendMessage(message);}}/** * 刷新时间  * @author Administrator */class MessageHandler extends Handler {@Overridepublic void handleMessage(Message msg) {// 此处可以更新UI  Bundle bundle = msg.getData();String currencyTime = bundle.getString("currencyTime");MainActivity.this.tvTime.setText(currencyTime);MainActivity.this.tvTime.invalidate();Log.i(TAG, "=============刷新时间===========" + currencyTime);initTimeTimer();}}}

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