android获取网络图片总是失败，求帮助

Question

想在android的ImageView里面显示一张网络图片但是图片一直不显示，manifest里面已经配置了访问网络的权限了，我先把代码都附上。
1.这个是GetWebIm.java
public class GetWebIm {

private Bitmap bitmap = null;

public Bitmap getPicBitmap(){ String url = "http://www.baidu.com/img/shouye_b5486898c692066bd2cbaeda86d74448.gif";

try {
URL myFileUrl = new URL(url);
HttpURLConnection conn = (HttpURLConnection) myFileUrl.openConnection();
conn.setDoInput(true);
conn.connect();

InputStream is = conn.getInputStream();
bitmap = BitmapFactory.decodeStream(is);
is.close();
} catch (Exception e) {
e.printStackTrace();
}

return bitmap;

}


}
2.这个是MainActivity.java
public class MainActivity extends Activity {
private ImageView im = null;


@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);



im = (ImageView)this.findViewById(R.id.id);

im.setImageBitmap(new GetWebIm().getPicBitmap());

}}
3.xml文件
<?xml version="1.0" encoding= "utf-8"?>
<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >
    <ImageView
        android:id="@+id/id"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        />
    
</LinearLayout>android网络图片

Answer 1

@SuppressLint("NewApi") public class BitmapActivity extends Activity {
static ImageView mImageView;
  Drawable drawable;
String url = "http://www.baidu.com/img/shouye_b5486898c692066bd2cbaeda86d74448.gif";//诸如此类的中文图片地址
static Bitmap bit;
//Bitmap bitmap ;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        MyView mv = new MyView(this);  
           //  setContentView(mv);  
        setContentView(R.layout.activity_bitmap);
      
        MyThread myThread = new MyThread(); 
        myThread.start(); 
//        mImageView = (ImageView)this.findViewById(R.id.imageView1) ;     
//      drawable = loadImageFromNetwork(url );     
//        mImageView.setImageDrawable(drawable) ;   
        
        
//       mImageView = (ImageView)this.findViewById(R.id.imageView1) ;     
//        new Thread(new Runnable(){     
//            Drawable drawable = loadImageFromNetwork(url);     
//           @Override     
//          public void run() {     
//                    
//               // post() 特别关键，就是到UI主线程去更新图片                     
//             mImageView.post(new Runnable(){     
//              @Override     
//             public void run() {     
//                   // TODO Auto-generated method stub     
//                   mImageView.setImageDrawable(drawable) ;     
//              }}) ;     
//               }     
//                   
//        }).start()  ;          
        
        mImageView = (ImageView)this.findViewById(R.id.imageView1) ;     
        new DownloadImageTask().execute(url) ;     
       
       
    }
    
    class DownloadImageTask extends AsyncTask<String, Void, Drawable>      
    {     
                 
          protected Drawable doInBackground(String... urls) {     
              return loadImageFromNetwork(urls[0]);     
           }     
       
            protected void onPostExecute(Drawable result) {     
               mImageView.setImageDrawable(result);     
          }     
    }       private Drawable loadImageFromNetwork(String imageUrl)     
    {     
        Drawable drawable = null;     
        try {     
            // 可以在这里通过文件名来判断，是否本地有此图片     
            drawable = Drawable.createFromStream(     
                    new URL(imageUrl).openStream(), "image.jpg");     
        } catch (IOException e) {     
            Log.d("test", e.getMessage());     
        }     
        if (drawable == null) {     
            Log.d("test", "null drawable");     
       } else {     
            Log.d("test", "not null drawable");     
        }     
            
        return drawable ;     
    }    
    class MyThread extends Thread{         public void run() { 
        // while(true){
         bit = returnBitMap(url);
       
        
     handler.sendEmptyMessage(0);
         //}
       }   
  } 
    //定义Handler对象
   private Handler handler =new Handler(){
   @Override
   //当有消息发送出来的时候就执行Handler的这个方法
   public void handleMessage(Message msg){
   super.handleMessage(msg);
   //处理UI
   }
   };
    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.bitmap, menu);
        return true;
    }
    
    public Bitmap returnBitMap(String ur) {   
      //  String url = "http://www.baidu.com/img/shouye_b5486898c692066bd2cbaeda86d74448.gif";//诸如此类的中文图片地址
         URL myFileUrl = null;   
        Bitmap bitmap = null;          try {   
           myFileUrl = new URL(url);  
         }catch (MalformedURLException e) { 
          e.printStackTrace();  
         }try {   
          HttpURLConnection conn = (HttpURLConnection) myFileUrl.openConnection();   
           conn.setDoInput(true);  
         conn.connect();           InputStream is = conn.getInputStream();   
        bitmap = BitmapFactory.decodeStream(is);   
        is.close(); 
       }catch (IOException e) { 
         e.printStackTrace();   
        } 
          return bitmap;  
       }
    
    public class MyView extends View {  
    
             MyView(Context context) {  
                super(context);  
            }  
               
             @Override  
            protected void onDraw(Canvas canvas) {  
                // TODO Auto-generated method stub   
                super.onDraw(canvas);  
                 
                // 首先定义一个paint    
                Paint paint = new Paint();   
     
                // 绘制矩形区域-实心矩形    
              // 设置颜色    
               paint.setColor(Color.BLUE);   
              // 设置样式-填充    
                 paint.setStyle(Style.FILL);   
                // 绘制一个矩形    
               canvas.drawRect(new Rect(0, 0, getWidth(), getHeight()), paint);   
      
                // 绘空心矩形    
               // 设置颜色    
                paint.setColor(Color.RED);   
               // 设置样式-空心矩形    
                paint.setStyle(Style.STROKE);   
              canvas.drawRect(new Rect(10, 10, 100, 30), paint);   
      
              // 绘文字    
               // 设置颜色    
              paint.setColor(Color.GREEN);   
               // 绘文字    
                canvas.drawText("Hello", 10, 50, paint);   
      
                 // 绘图    
               canvas.drawBitmap(bit, 10, 60, paint);   
          }  
             
        }  
        
  
    
}