加載圖片從URL問題

我有一個onClickListener應該調用一個類，顯示和圖像從一個靜態的url。我在所謂的課堂上敬酒，並且表現出沒有形象。 list.onClickListener應該調用應該發佈圖像的類ShowImage。請幫助我不確定我在做什麼不正確。加載圖片從URL問題

注意*在我的main_layout.xml中我有一個imageview。

package com.flash_tattoo; 

import java.io.InputStream; 
import java.net.URL; 
import java.util.ArrayList; 
import java.util.List; 

import org.json.JSONArray; 
import org.json.JSONException; 

import android.app.Activity; 
import android.content.Intent; 
import android.graphics.drawable.Drawable; 
import android.os.Bundle; 
import android.view.View; 
import android.view.View.OnClickListener; 
import android.widget.AdapterView; 
import android.widget.Button; 
import android.widget.ImageView; 
import android.widget.ListView; 
import android.widget.Toast; 
import android.widget.AdapterView.OnItemClickListener; 


public class MainActivity extends Activity { 

    ListView list; 
    LazyAdapter adapter; 

    @Override 
    public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.main_layout); 

     Bundle bundle = getIntent().getExtras(); 
     String jsonData = bundle.getString("jsonData"); 

       JSONArray jsonArray; 
       try { 
        jsonArray = new JSONArray(jsonData); 

        String[] mStrings = new String[jsonArray.length()]; 
        String[] mImages = new String[jsonArray.length()]; 
        String[] mPath = new String[jsonArray.length()]; 

        for (int i=0; i<jsonArray.length(); i++) 
        { 
         String url = jsonArray.getJSONArray(i).getString(2); 
         mStrings[i] = "http://www.2020mediaonline.com/tattoo/thumbnail_image/" + url; 

         String image_name = jsonArray.getJSONArray(i).getString(1); 
         mImages[i] = image_name; 

         String path_name = jsonArray.getJSONArray(i).getString(1); 
         mPath[i] = path_name; 

        } 


        list=(ListView)findViewById(R.id.list); 
        adapter=new LazyAdapter(this, mStrings, mImages); 
        list.setAdapter(adapter); 


        list.setOnItemClickListener(new OnItemClickListener() { 
         public void onItemClick(AdapterView<?> arg0, View arg1, int arg2, long arg3){ 

          ShowImage go = new ShowImage(); 

          Toast.makeText(MainActivity.this, "In onClick", Toast.LENGTH_LONG).show(); 

         } 
        }); 



        Button b=(Button)findViewById(R.id.button1); 
        b.setOnClickListener(listener); 

       } catch (JSONException e) { 
        // TODO Auto-generated catch block 
        e.printStackTrace(); 
       } 


    } 

    class ShowImage extends Activity { 
     /** Called when the activity is first created. */ 
     @Override 
     public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.main_layout); 

     ImageView imgView =(ImageView)findViewById(R.id.ImageView01); 

     Drawable drawable = LoadImageFromWebOperations("http://www.ansi.okstate.edu/breeds/other/llama/llama1.jpg"); 
     imgView.setImageDrawable(drawable); 
     Toast.makeText(MainActivity.this, "show big image", Toast.LENGTH_LONG).show(); 
     } 

     private Drawable LoadImageFromWebOperations(String url) 
     { 
      try 
      { 
       InputStream is = (InputStream) new URL(url).getContent(); 
       Drawable d = Drawable.createFromStream(is, "src name"); 
       return d; 
       }catch (Exception e) { 
       System.out.println("Exc="+e); 
       return null; 
       } 
      } 
     } 

    @Override 
    public void onDestroy() 
    { 
     adapter.imageLoader.stopThread(); 
     list.setAdapter(null); 
     super.onDestroy(); 
    } 

    public OnClickListener listener=new OnClickListener(){ 
     @Override 
     public void onClick(View arg0) { 
     Intent myIntent = new Intent(MainActivity.this,flash_tattoo.class); 
      startActivityForResult(myIntent, 0); 
     } 
    }; 

}

來源

2011-08-01 Denoteone