在Android线程中设置控件的值一般会与Handler联合使用，如下：
package com.bbk.android;
import java.io.FilterInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Bundle;
import android.os.Handler;
import android.os.Looper;
import android.util.Log;
import android.widget.ImageView;
import android.widget.Toast;
/**
* @ClassName: PicActivity
* @Description: 显示网络图片
*/
public class PicActivity extends Activity {
/** Called when the activity is first created. */
String imageUrl = "http://content.52pk.com/files/100623/2230_102437_1_lit.jpg";
ImageView imView;
URL myFileUrl = null;
static Bitmap bitmap = null;
private Handler handler;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_pic);
handler = new Handler(){
public void handleMessage(android.os.Message msg) {
//处理消息
if (msg.what == 0x01) {
Log.e("aaaa3",bitmap+"");
imView = (ImageView) findViewById(R.id.imageView);
imView.setImageBitmap(bitmap);
}
};
};
returnBitMap();
}
/**
* @ClassName: PicThread
* @Description: 链接网络并下载图片线程
* @注：在子线程中不能对控件进行操作，因此联合Handler一起使用
*/
private class PicThread extends Thread{
@Override
public void run() {
Looper.prepare();
try {
myFileUrl = new URL(imageUrl);
} catch (MalformedURLException e) {
e.printStackTrace();
}
try {
HttpURLConnection conn = (HttpURLConnection) myFileUrl
.openConnection();
conn.setDoInput(true);
conn.connect();
InputStream is = conn.getInputStream();
Log.e("aaaa1",is+"");
bitmap = BitmapFactory.decodeStream(new PatchInputStream(is));
Log.e("aaaa2",bitmap+"");
handler.sendEmptyMessage(0x01);
is.close();
} catch (IOException e) {
e.printStackTrace();
}
Looper.loop();
}
}
public class PatchInputStream extends FilterInputStream{
protected PatchInputStream(InputStream in) {
super(in);
// TODO Auto-generated constructor stub
}
public long skip(long n)throws IOException{
long m=0l;
while(m<n){
long _m=in.skip(n-m);
if(_m==0l){
break;
}
m+=_m;
}
return m;
}
}
public void returnBitMap(){
new PicThread().start();
}
}