Android线程之Thread 、Runnable 的两个例子

Thread例子：

 package fy.test;
 import android.app.Activity;
 import android.os.Bundle;
 import android.os.Handler;
 import android.os.Message;
 import android.widget.TextView;
 public class MyTest extends Activity {
     public static final int REFRESH = 0x000001;
     private TextView text = null;
     private int i = 0;
     private Handler mHandler = null;
     /** Called when the activity is first created. */
     @Override
     public void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.main);
         text = (TextView) findViewById(R.id.threadText);
         mHandler = new Handler() {
             @Override
             public void handleMessage(Message msg) {
                 if (msg.what == REFRESH) {
                     text.setText(i + "");
                 }
                 super.handleMessage(msg);
             }
         };
         new MyThread().start();
     }
     public class MyThread extends Thread {
         public void run() {
             while (!Thread.currentThread().isInterrupted()) {
                 i++;
                 Message msg = new Message();
                 msg.what = REFRESH;
                 mHandler.sendMessage(msg);
                 try {
                     Thread.sleep(1000);
                 } catch (InterruptedException e) {
                     e.printStackTrace();
                 }
             }
         }
     }
 }

Runnable 例子：

package com.bgxt.datatimepickerdemo;

import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.util.EntityUtils;

import android.app.Activity;
import android.app.ProgressDialog;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;

public class HandlerMessageActivity1 extends Activity {
    private Button btnDown;
    private ImageView ivImage;
    private static String image_path = "http://ww4.sinaimg.cn/bmiddle/786013a5jw1e7akotp4bcj20c80i3aao.jpg";
    private ProgressDialog dialog;
    private static int IS_FINISH = 1;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.asynctask_activity);

        btnDown = (Button) findViewById(R.id.btnDown);
        ivImage = (ImageView) findViewById(R.id.ivSinaImage);

        dialog = new ProgressDialog(this);
        dialog.setTitle("提示信息");
        dialog.setMessage("正在下载，请稍后...");
        dialog.setCancelable(false);

        btnDown.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                    new Thread(new MyThread()).start();
                    dialog.show();
            }
        });
    }

    private  Handler handler = new Handler() {
        // 在Handler中获取消息，重写handleMessage()方法
        @Override
        public void handleMessage(Message msg) {
            // 判断消息码是否为1
            if(msg.what==IS_FINISH){
                byte[] data=(byte[])msg.obj;
                Bitmap bmp=BitmapFactory.decodeByteArray(data, 0, data.length);
                ivImage.setImageBitmap(bmp);
                dialog.dismiss();
            }
        }
    };

    public class MyThread implements Runnable {

        @Override
        public void run() {
            HttpClient httpClient = new DefaultHttpClient();
            HttpGet httpGet = new HttpGet(image_path);
            HttpResponse httpResponse = null;
            try {
                httpResponse = httpClient.execute(httpGet);
                if (httpResponse.getStatusLine().getStatusCode() == 200) {
                    byte[] data = EntityUtils.toByteArray(httpResponse
                            .getEntity());
                    // 获取一个Message对象，设置what为1
                    Message msg = Message.obtain();
                    msg.obj = data;
                    msg.what = IS_FINISH;
                    // 发送这个消息到消息队列中
                    handler.sendMessage(msg);
                }
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }
}