方法一、使用Handler和Thread（线程）实现定时器

复制代码 代码如下:
package com.xunfang.handerDemo;
import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.widget.TextView;
public class HanderDemoActivity extends Activity {
TextView tvShow;
private int i = 0;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
tvShow = (TextView) findViewById(R.id.tv_show);
new Thread(new ThreadShow()).start();
}
// handler类接收数据
Handler handler = new Handler() {
public void handleMessage(Message msg) {
if (msg.what == 1) {
tvShow.setText(Integer.toString(i++));
System.out.println("receive....");
}
};
};
// 线程类
class ThreadShow implements Runnable {
@Override
public void run() {
while (true) {
try {
Thread.sleep(1000);
Message msg = new Message();
msg.what = 1;
handler.sendMessage(msg);
System.out.println("send...");
} catch (Exception e) {
e.printStackTrace();
System.out.println("thread error...");
}
}
}
}
}

方法二、使用Handler类自带的postDelyed实现定时器

复制代码 代码如下:
package com.xunfang.handerDemo;
import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.widget.TextView;
public class HanderDemoActivity extends Activity {
TextView tvShow;
private int i = 0;
private int TIME = 1000;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
tvShow = (TextView) findViewById(R.id.tv_show);
handler.postDelayed(runnable, TIME); //每隔1s执行
}
Handler handler = new Handler();
Runnable runnable = new Runnable() {
@Override
public void run() {
// handler自带方法实现定时器
try {
handler.postDelayed(this, TIME);
tvShow.setText(Integer.toString(i++));
System.out.println("do...");
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
System.out.println("exception...");
}
}
};
}

方法三、使用Handler、Timer和TimerTask三个Android类实现定时器

复制代码 代码如下:
package com.xunfang.handerDemo;
import java.util.Timer;
import java.util.TimerTask;
import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.widget.TextView;
public class HanderDemoActivity extends Activity {
TextView tvShow;
private int i = 0;
private int TIME = 1000;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
tvShow = (TextView) findViewById(R.id.tv_show);
timer.schedule(task, 1000, 1000); // 1s后执行task,经过1s再次执行
}
Handler handler = new Handler() {
public void handleMessage(Message msg) {
if (msg.what == 1) {
tvShow.setText(Integer.toString(i++));
}
super.handleMessage(msg);
};
};
Timer timer = new Timer();
TimerTask task = new TimerTask() {
@Override
public void run() {
// 发送消息
Message message = new Message();
message.what = 1;
handler.sendMessage(message);
}
};
}