Android handler 详解（面试必问）

package com.example.uri;
import java.io.IOException;
import java.io.InputStream;
import java.lang.ref.WeakReference;
import java.net.MalformedURLException;
import java.net.URL;
import android.net.Uri;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.view.Menu;
import android.view.View;
import android.widget.ImageView;
/**
* 
* 访问网络的操作，必须放在工作线程中完成
*
*/
public class MainActivity extends Activity {
private static final int LOADSUCCESS=0x1;
private static ImageView iv;
private final myhandler handler=new myhandler(this);
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
iv=(ImageView) findViewById(R.id.imageView1);
}
private static class myhandler extends Handler{
private final WeakReference<MainActivity> weakReference;
public myhandler(MainActivity mainActivity){
weakReference=new WeakReference<MainActivity>(mainActivity);
}
public void handleMessage(Message msg) {
MainActivity mainActivity=weakReference.get();
if(mainActivity!=null){
switch (msg.what) {
case LOADSUCCESS:
MainActivity.iv.setImageBitmap((Bitmap) msg.obj);
break;
}
}
}
}
public void geturl(View v){
/*Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse("http://www.baidu.com"));
startActivity(intent); */
new Thread(new Runnable() {
@Override
public void run() {
try {
URL url=new URL("http://img2.3lian.com/img2007/10/28/123.jpg");
InputStream in=url.openStream();
Bitmap bitmap=BitmapFactory.decodeStream(in);
Message message= handler.obtainMessage(LOADSUCCESS, bitmap);
handler.sendMessage(message);
} catch (MalformedURLException e) {
// TODO 自动生成的 catch 块
e.printStackTrace();
} catch (IOException e) {
// TODO 自动生成的 catch 块
e.printStackTrace();
}
}
}).start();
}
}