android的GridView显示网络图片的方法 .

首先Activity.java的写法如下

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1. package com.lujianfei.active;  
2.   
3.    
4. import java.util.ArrayList;  
5. import java.util.HashMap;  
6.   
7. import android.app.Activity;  
8. import android.graphics.Bitmap;  
9. import android.os.Bundle;  
10. import android.view.View;  
11. import android.widget.GridView;  
12. import android.widget.ImageView;  
13. import android.widget.SimpleAdapter;  
14. import android.widget.SimpleAdapter.ViewBinder;  
15.   
16. import com.lujianfei.data.IData;  
17. import com.lujianfei.data.IDataFactory;  
18. import com.lujianfei.util.BitmapHelper;  
19.   
20.   
21. public class VideoprojActivity extends Activity {  
22.       
23.     IData data = null;  
24.     IDataFactory dataFactory = null;  
25.       
26.     GridView gridview = null;    
27.     
28.   
29.     /** Called when the activity is first created. */  
30.     @Override  
31.     public void onCreate(Bundle savedInstanceState) {  
32.         super.onCreate(savedInstanceState);  
33.         setContentView(R.layout.videoproj_gridview_layout);  
34.         gridview = (GridView) findViewById(R.id.gridview);      
35.           
36.           
37.         ArrayList<HashMap<String,Object>> list=new ArrayList<HashMap<String,Object>>();    
38.         HashMap<String,Object> map=null;    
39.            
40.          
41.             
42.         for(int i=0;i<3;i++)    
43.         {    
44.         map=new HashMap<String,Object>();    
45.         map.put("ItemImage",BitmapHelper.getBitmap("http://192.168.1.119:8080/strutsproj/upload/type1.jpg"));    
46.         map.put("ItemText","ItemText"+i);    
47.         list.add(map);    
48.         }    
49.         SimpleAdapter adapter = new SimpleAdapter(this,list,R.layout.videoproj_gridview_item_layout,new String[]{"ItemImage","ItemText"},new int[]{R.id.ItemImage,R.id.ItemText});    
50.         adapter.setViewBinder(new ViewBinder(){    
51.     
52.           public boolean setViewValue(View view, Object data,     
53.                   String textRepresentation) {     
54.                 //判断是否为我们要处理的对象       
55.                 if(view instanceof ImageView && data instanceof Bitmap){     
56.                   ImageView iv = (ImageView) view;     
57.                   iv.setImageBitmap((Bitmap) data);     
58.                   return true;     
59.                 }else     
60.                 return false;     
61.               }     
62.     
63.         
64.       });    
65.   
66.         gridview.setAdapter(adapter);      
67.   
68.     }  
69.        
70. }  

package com.lujianfei.active; import java.util.ArrayList;import java.util.HashMap;import android.app.Activity;import android.graphics.Bitmap;import android.os.Bundle;import android.view.View;import android.widget.GridView;import android.widget.ImageView;import android.widget.SimpleAdapter;import android.widget.SimpleAdapter.ViewBinder;import com.lujianfei.data.IData;import com.lujianfei.data.IDataFactory;import com.lujianfei.util.BitmapHelper;public class VideoprojActivity extends Activity {IData data = null;IDataFactory dataFactory = null;    GridView gridview = null;        /** Called when the activity is first created. */    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.videoproj_gridview_layout);        gridview = (GridView) findViewById(R.id.gridview);                            ArrayList<HashMap<String,Object>> list=new ArrayList<HashMap<String,Object>>();          HashMap<String,Object> map=null;                                    for(int i=0;i<3;i++)          {          map=new HashMap<String,Object>();          map.put("ItemImage",BitmapHelper.getBitmap("http://192.168.1.119:8080/strutsproj/upload/type1.jpg"));          map.put("ItemText","ItemText"+i);          list.add(map);          }          SimpleAdapter adapter = new SimpleAdapter(this,list,R.layout.videoproj_gridview_item_layout,new String[]{"ItemImage","ItemText"},new int[]{R.id.ItemImage,R.id.ItemText});          adapter.setViewBinder(new ViewBinder(){              public boolean setViewValue(View view, Object data,                     String textRepresentation) {                   //判断是否为我们要处理的对象                    if(view instanceof ImageView && data instanceof Bitmap){                     ImageView iv = (ImageView) view;                     iv.setImageBitmap((Bitmap) data);                     return true;                   }else                   return false;                 }                 });          gridview.setAdapter(adapter);        }     }

 

核心类 BitmapHelper.java

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1. package com.lujianfei.util;  
2.   
3. import java.io.IOException;  
4. import java.io.InputStream;  
5. import java.net.HttpURLConnection;  
6. import java.net.MalformedURLException;  
7. import java.net.URL;  
8.   
9. import android.graphics.Bitmap;  
10. import android.graphics.BitmapFactory;  
11.   
12. public class BitmapHelper {  
13.     public static Bitmap getBitmap(String imageUrl) {  
14.         Bitmap mBitmap = null;  
15.         try {  
16.             URL url = new URL(imageUrl);  
17.             HttpURLConnection conn = (HttpURLConnection) url.openConnection();  
18.             InputStream is = conn.getInputStream();  
19.             mBitmap = BitmapFactory.decodeStream(is);  
20.   
21.         } catch (MalformedURLException e) {  
22.             e.printStackTrace();  
23.         } catch (IOException e) {  
24.             e.printStackTrace();  
25.         }  
26.   
27.         return mBitmap;  
28.     }  
29.   
30. }  

package com.lujianfei.util;import java.io.IOException;import java.io.InputStream;import java.net.HttpURLConnection;import java.net.MalformedURLException;import java.net.URL;import android.graphics.Bitmap;import android.graphics.BitmapFactory;public class BitmapHelper {public static Bitmap getBitmap(String imageUrl) {Bitmap mBitmap = null;try {URL url = new URL(imageUrl);HttpURLConnection conn = (HttpURLConnection) url.openConnection();InputStream is = conn.getInputStream();mBitmap = BitmapFactory.decodeStream(is);} catch (MalformedURLException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();}return mBitmap;}}

 

videoproj_gridview_layout.xml

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1. <?xml version="1.0" encoding="utf-8"?>      
2. <GridView xmlns:android="http://schemas.android.com/apk/res/android"       
3.     android:id="@+id/gridview"      
4.     android:layout_width="fill_parent"       
5.     android:layout_height="fill_parent"      
6.     android:numColumns="auto_fit"      
7.     android:verticalSpacing="10dp"      
8.     android:horizontalSpacing="10dp"      
9.     android:columnWidth="90dp"      
10.     android:stretchMode="columnWidth"      
11.     android:gravity="center"      
12. />    

<?xml version="1.0" encoding="utf-8"?>    <GridView xmlns:android="http://schemas.android.com/apk/res/android"         android:id="@+id/gridview"        android:layout_width="fill_parent"         android:layout_height="fill_parent"        android:numColumns="auto_fit"        android:verticalSpacing="10dp"        android:horizontalSpacing="10dp"        android:columnWidth="90dp"        android:stretchMode="columnWidth"        android:gravity="center"    />  

 

videoproj_gridview_item_layout.xml

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1. <?xml version="1.0" encoding="utf-8"?>  
2. <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"  
3.     android:layout_width="fill_parent"  
4.     android:layout_height="wrap_content"  
5.     android:paddingBottom="4dip" >  
6.   
7.     <ImageView  
8.         android:id="@+id/ItemImage"  
9.         android:layout_width="wrap_content"  
10.         android:layout_height="wrap_content"  
11.         android:layout_centerHorizontal="true" >  
12.     </ImageView>  
13.   
14.     <TextView  
15.         android:id="@+id/ItemText"  
16.         android:layout_width="wrap_content"  
17.         android:layout_height="wrap_content"  
18.         android:layout_below="@+id/ItemImage"  
19.         android:layout_centerHorizontal="true"  
20.         android:text="TextView01" >  
21.     </TextView>  
22.   
23. </RelativeLayout>  

<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="fill_parent"    android:layout_height="wrap_content"    android:paddingBottom="4dip" >    <ImageView        android:id="@+id/ItemImage"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_centerHorizontal="true" >    </ImageView>    <TextView        android:id="@+id/ItemText"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_below="@+id/ItemImage"        android:layout_centerHorizontal="true"        android:text="TextView01" >    </TextView></RelativeLayout>

 

运行效果如下