图像显示为gridview

Question

我想显示图像从mysql服务器（在localhost中测试）使用imageurl，我有我的服务器上的图像，在android客户端应用程序作为gridview与text.how我使用imageurl我的代码？ mymainmenu.java

public class MainMenu extends Activity { 



    GridView gridView; 

    static final String[] MOBILE_OS = new String[] { 
     "Android", "iOS","Windows", "Blackberry" }; 

    @Override 
    public void onCreate(Bundle savedInstanceState) { 

     super.onCreate(savedInstanceState); 
     setContentView(R.layout.mainmenu_list); 


     gridView = (GridView) findViewById(R.id.gridView1); 

     gridView.setAdapter(new ImageAdapter(this, MOBILE_OS)); 

     gridView.setOnItemClickListener(new OnItemClickListener() { 
      public void onItemClick(AdapterView<?> parent, View v, 
        int position, long id) { 
       Toast.makeText(
        getApplicationContext(), 
        ((TextView) v.findViewById(R.id.grid_item_label)) 
        .getText(), Toast.LENGTH_SHORT).show(); 

      } 
     }); 

    } 

} 

我imageadapter.java：

public class ImageAdapter extends BaseAdapter { 
private Context context; 
private final String[] mobileValues; 
    public ImageAdapter(Context context, String[] mobileValues) { 
    this.context = context; 
    this.mobileValues = mobileValues; 
} 

public View getView(int position, View convertView, ViewGroup parent) { 

    LayoutInflater inflater = (LayoutInflater) context 
     .getSystemService(Context.LAYOUT_INFLATER_SERVICE); 

    View gridView; 

    if (convertView == null) { 

     gridView = new View(context); 

     // get layout from list.xml 
     gridView = inflater.inflate(R.layout.list, null); 

     // set value into textview 
     TextView textView = (TextView) gridView 
       .findViewById(R.id.grid_item_label); 
     textView.setText(mobileValues[position]); 

     // set image based on selected text 
     ImageView imageView = (ImageView) gridView 
       .findViewById(R.id.grid_item_image); 

     String mobile = mobileValues[position]; 

     if (mobile.equals("Windows")) { 
      imageView.setImageResource(R.drawable.imggrid); 
     } else if (mobile.equals("iOS")) { 
      imageView.setImageResource(R.drawable.imggrid); 
     } else if (mobile.equals("Blackberry")) { 
      imageView.setImageResource(R.drawable.imggrid); 
     } else { 
      imageView.setImageResource(R.drawable.imggrid); 
     } 

    } else { 
     gridView = (View) convertView; 
    } 

    return gridView; 
} 

@Override 
public int getCount() { 
    return mobileValues.length; 
} 

@Override 
public Object getItem(int position) { 
    return null; 
} 

@Override 
public long getItemId(int position) { 
    return 0; 
} 

}

我硝基甲苯知道如何使用我的代码如下：

try { 
      URL url = new URL(imageFileURL); 
      URLConnection conn = url.openConnection();     
      HttpURLConnection httpConn = (HttpURLConnection)conn; 
      httpConn.setRequestMethod("GET"); 
      httpConn.connect();    
      if (httpConn.getResponseCode() == HttpURLConnection.HTTP_OK) { 
      InputStream inputStream = httpConn.getInputStream();      
      Bitmap bitmap = BitmapFactory.decodeStream(inputStream); 
      inputStream.close(); 
      img.setImageBitmap(bitmap); 
      } 
      } catch (MalformedURLException e1) { 
      // TODO Auto-generated catch block 
      e1.printStackTrace(); 
      } catch (IOException e) { 
      // TODO Auto-generated catch block 
      e.printStackTrace(); 
      } 

Answer 1

把图像下载代码AsyncTask。 Here is the explanation。 在getView方法中执行一个asynctask实例，即每次获取一个图像。执行你的AsyncTask让它知道在哪里图像下载后置之前

private class DownloadImageTask extends AsyncTask<String, Void, Bitmap> { 
ImageView mImageView; 
public void setImageView(ImageView img) { 
     mImageView = img; 
} 

protected Bitmap doInBackground(String... urls) { 
    return loadImageFromNetwork(urls[0]); 
} 

protected void onPostExecute(Bitmap result) { 
    mImageView.setImageBitmap(result); 
} 

}

呼叫task.setImageView(yourImageViewinGrid)。

Answer 2

我硝基甲苯知道如何使用我的代码如下：

该代码会下载图像，你可以在单独的线程中放置任何AsyncTask或Thread并设置在下载图像imageview ...就这么简单。有在网络上这么多例子，你可以在google出来

EIDTED

代码下载图像

public class AsyncFetchImage extends AsyncTask<String, Void, Bitmap>{ 

    private WeakReference<ImageView> imageReference; 
// private WeakReference<Dialog> dialogReferance; 

    public AsyncFetchImage(ImageView imageview) { 
     imageReference = new WeakReference<ImageView>(imageview); 
//  dialogReferance = new WeakReference<Dialog>(dialog); 
    } 

    @Override 
    protected Bitmap doInBackground(String... s) { 

     return downloadImage(s[0]); 
    } 

    private Bitmap downloadImage(String url) { 

     final AndroidHttpClient client = AndroidHttpClient.newInstance("Nixit"); 
     final HttpGet getRequest = new HttpGet(url); 
     try { 

      HttpResponse response = client.execute(getRequest); 
      final int statusCode = response.getStatusLine().getStatusCode(); 

      if(statusCode != HttpStatus.SC_OK){ 
       Log.w("ImageDownloader", "Error " + statusCode + " while retrieving bitmap from " + url); 
       return null; 
      } 
      final HttpEntity entity = response.getEntity(); 
      if(entity != null){ 
       InputStream is = null; 
       try{ 
        is = entity.getContent(); 
        final Bitmap bit = BitmapFactory.decodeStream(is); 
        return bit; 
       }finally{ 
        if(is != null) 
         is.close(); 
        entity.consumeContent(); 
       } 
      } 


     } catch (IOException e) { 
      e.printStackTrace(); 
      return null; 
     } finally{ 
      if(client != null){ 
       client.close(); 
      } 
     } 
     Log.i("Image Fetch","Image Fetch Complete"); 
     return null; 
    } 

    @Override 
    protected void onPostExecute(Bitmap result) { 
     if(isCancelled()){ 
      result = null; 
     } 
     if(imageReference != null){ 
      ImageView imageView = imageReference.get(); 
//   Dialog di = dialogReferance.get(); 
      if (imageView != null) { 
       imageView.setImageBitmap(result); 
//    di.show(); 
      } 

     } 
    } 


} 

如何使用： -

imageView = (ImageView)dialog.findViewById(R.id.imageView1); 

AsyncFetchImage fetchImage = new AsyncFetchImage(imageView); 
fetchImage.execute(url); 

你可以使用此适配器的getview方法

希望能够帮助

Answer 3

为了获取图像，你必须做一些事情，如：

URL new_url = new URL("your url"); 
Bitmap image_bitmap = BitmapFactory.decodeStream(newurl.openConnection() .getInputStream()); ImageView image_view = new ImageView(this); 
image_view.setImageBitmap(image_bitmap); 

无论如何，最好是下载图片作为背景的任务。我实际上做的是使用一个私有内部类来创建一个自定义视图，该内部类扩展AsyncTask以便为您下载图像。