android的Handle计时器实现代码

解决方法：

1、activity_main.xml

xmlns:tools="http://schemas.android.com/tools"

android:layout_width="fill_parent"

android:layout_height="fill_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"

android:id="@+id/root"

tools:context="com.example.ff.MainActivity" >

android:id="@+id/txtTimer"

android:gravity="center_horizontal"

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:textSize="25sp"

android:text="当前时间: 00:00:00" />

android:id="@+id/btnBegin"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_alignLeft="@+id/txtTimer"

android:layout_below="@+id/txtTimer"

android:layout_marginLeft="49dp"

android:layout_marginTop="26dp"

android:text="开始" />

android:id="@+id/btnEnd"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_alignBaseline="@+id/btnBegin"

android:layout_alignBottom="@+id/btnBegin"

android:layout_marginLeft="37dp"

android:layout_toRightOf="@+id/btnBegin"

android:text="停止" />

2、MainActivity.java

package com.example.ff;

import java.sql.Time;

import android.app.Activity;

import android.os.Bundle;

import android.os.Handler;

import android.util.Log;

import android.view.View;

import android.widget.Button;

import android.widget.TextView;

public class MainActivity extends Activity {

Button btnBegin;

Button btnEnd;

TextView txtTimer;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

btnBegin = (Button) findViewById(R.id.btnBegin);

btnEnd = (Button) findViewById(R.id.btnEnd);

txtTimer = (TextView) findViewById(R.id.txtTimer);

btnBegin.setOnClickListener(listenerBegin);

btnEnd.setOnClickListener(listenerEnd);

}

//实例化Handle对象

Handler handler = new Handler();

//操作的线程

Runnable updateThread = new Runnable(){

@Override

public void run() {

Log.i("Handle", new Time(System.currentTimeMillis()).toString());

//更新界面上的时间

txtTimer.setText("当前时间是:" + new Time(System.currentTimeMillis()));

//1秒钟后，再加一个线程到队列中

handler.postDelayed(updateThread, 1000);

}

};

//开始按钮

View.OnClickListener listenerBegin = new View.OnClickListener() {

@Override

public void onClick(View v) {

Log.i("Handle",new Time(System.currentTimeMillis()).toString());

//往队列中放入第一个线程

handler.post(updateThread);

}

};

//结束按钮

View.OnClickListener listenerEnd = new View.OnClickListener() {

@Override

public void onClick(View v) {

//结束整个队列的运行

handler.removeCallbacks(updateThread);

}

};

}