android 多线程笔记

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package com.example.appsmain;import java.util.Timer;import java.util.TimerTask;import android.support.v7.app.ActionBarActivity;import android.os.Bundle;import android.os.Handler;import android.os.Message;import android.util.Log;import android.view.Menu;import android.view.MenuItem;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.TextView;import android.widget.Toast;public class MainActivity extends ActionBarActivity {  private Button mButton;    private TextView mTextView;    private boolean isRunning = true;    private Thread mThread;    private int timer = 0;    private Handler handler;    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        mButton = (Button) findViewById(R.id.button1);        mTextView = (TextView) findViewById(R.id.textView1);        mButton.setOnClickListener(new OnClickListener() {            @Override            public void onClick(View arg0) {                // TODO Auto-generated method stub                isRunning = false;//停止线程方法一                //                if (mThread!= null) { //停止线程方法二  //                mThread.interrupt(); //外围调用关闭  //                }            }        });                        handler = new Handler() {//接收消息的子线程            @Override                    public void handleMessage(Message msg) {                switch (msg.what) {                case 0:                    mTextView.setText("计时:" + msg.obj);                     }            }        };                mThread = new Thread(new Runnable() {//新建的线程            @Override            public void run() {                try {                    while (isRunning) {                        Thread.currentThread().sleep(1000);//计时时间 1s                        timer++;                        Message message = new Message();//可传递到其它线程的消息                        message.arg1 = 123;//整形                        message.obj = timer;// Object 类型                        message.what = 0;//what  用户自定义的消息代码，这样接受者可以了解这个消息的信息。每个handler各自包含自己的消息代码，所以不用担心自定义的消息跟其他handlers有冲突。                        handler.sendMessage(message);                    }                } catch (InterruptedException e) {                    e.printStackTrace();                }            }        });        mThread.start();    }    }
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