Android中Timer计时器详解

直接上代码，解释看注释，一个火箭发射倒计时的例子

main.xml

[html] <?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >

    <Button
        android:id="@+id/button"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="开始倒计时" />

    <TextView
        android:id="@+id/textView"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content" />

</LinearLayout>
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >

</LinearLayout>
TimerDemoActivity.java

[java] package com.tianjf;

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.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;

public class TimerDemoActivity extends Activity implements OnClickListener {

    private Button button;
    private TextView textView;
    private Timer timer;

    // 定义Handler
    Handler handler = new Handler() {

        @Override
        public void handleMessage(Message msg) {
            super.handleMessage(msg);

            Log.d("debug", "handleMessage方法所在的线程："
                    + Thread.currentThread().getName());

            // Handler处理消息
            if (msg.what > 0) {
                textView.setText(msg.what + "");
            } else {
                textView.setText("点火！");
                // 结束Timer计时器
                timer.cancel();
            }
        }
    };

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        button = (Button) findViewById(R.id.button);
        textView = (TextView) findViewById(R.id.textView);

        Log.d("debug", "onCreate方法所在的线程："
                + Thread.currentThread().getName());
        button.setOnClickListener(this);
    }

    @Override
    public void onClick(View v) {
        switch (v.getId()) {
        case R.id.button:
            // 按钮按下时创建一个Timer定时器
            timer = new Timer();
            // 创建一个TimerTask
            // TimerTask是个抽象类,实现了Runnable接口，所以TimerTask就是一个子线程
            TimerTask timerTask = new TimerTask() {
                // 倒数10秒
                int i = 10;

                @Override
                public void run() {
                    Log.d("debug", "run方法所在的线程："
                            + Thread.currentThread().getName());
                    // 定义一个消息传过去
                    Message msg = new

补充：移动开发 , Android ,