android动态显示图片

package com.example.addtextview;

import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;

import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.AsyncTask;
import android.os.Bundle;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.TextView;

public class MainActivity extends Activity {

private String []product_pic_array = {"url","url"};
private String []product_title_array = {"11","22"};

private TextView title;
private ImageView pic ;
private LinearLayout ll_product ;
private int row = 0;
/**
* 远程读取文件
* @param imagePath
* @return
*/
public static Bitmap getBitmapFromServer(String imagePath) {

HttpGet get = new HttpGet(imagePath);
HttpClient client = new DefaultHttpClient();
Bitmap pic = null;
try {
HttpResponse response = client.execute(get);
HttpEntity entity = response.getEntity();
InputStream is = entity.getContent();

pic = BitmapFactory.decodeStream(is); // 关键是这句代码

} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return pic;
}

public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView( R.layout.activity_main );

// 取得LinearLayout 物件
ll_product = (LinearLayout)findViewById(R.id.ll_product);
// 将TextView 加入到LinearLayout 中

if(product_pic_array!=null && product_pic_array.length==1){
new GetDataTask().execute(); //必须在新的线程中执行读取文件
}else{
new GetDataTask().execute();
}

}

//异步请求类
private class GetDataTask extends AsyncTask<Void, Void, List<ImageView>> {

protected List<ImageView> doInBackground(Void... params) {
List<ImageView> list = new ArrayList<ImageView>();
try {
for(int i=0;i<product_pic_array.length;i++){
Bitmap bitmap = getBitmapFromServer(product_pic_array[i]);
pic = new ImageView(MainActivity.this);
pic.setImageBitmap(bitmap);
list.add(pic);
}
} catch (Exception e) {
System.out.println(e);
}
return list;

}
protected void onPostExecute(List<ImageView> list) {
//在线程执行时不能把添加布局
if(list!=null && list.size()==1){
pic = (ImageView)list.get(0);
ll_product.addView(pic);//向布局中动态输入图片

title = new TextView(MainActivity.this); //向布局中动态输入TextView
title.setText(product_title_array[0]);
ll_product. addView (title);
}else{
for(int i=0;i<list.size();i++){
pic = (ImageView)list.get(i);
//设置图片高度宽度
LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams(100, 100);
pic.setLayoutParams(layoutParams);
ll_product.addView(pic);
}
}

}

}
}

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