Android - 如何显示来自URL的图像？

Question

我有一个ImageView，我需要做的就是在应用程序加载时从intetrnet中显示图像。有没有一个非常简单的方法来做到这一点？

Answer 1

HttpClient client = new DefaultHttpClient(); 
HttpGet get = new HttpGet(url); 

HttpResponse response = client.execute(get); 
Bitmap bitmap = BitmapFactory.decodeStream(response.getEntity().getContent()); 

Answer 2

ImageView.setImageURI似乎不适用于互联网资源，所以您应该自己阅读位图。

InputStream is = new URL("http://example.com/myimage.jpg").openStream(); 
Bitmap bitmap = BitmapFactory.decodeStream(is); 
is.close(); 
ImageView iv = (ImageView) findViewById(R.id.myImage); 
iv.setImageBitmap(bitmap); 

但是这会在UI线程上加载图像，这可能会导致打嗝。最好是在不同的线程，例如使用：

new AsyncTask<String, Void, Bitmap>() { 
    protected Bitmap doInBackground(String... params) { 
     try { 
      return loadBitmap(params[0]); 
     } catch (Exception e) { 
      Log.e("imagetask", "error loading bitmap", e); 
      return null; 
     } 
    } 

    protected Bitmap loadBitmap(String urlSpec) throws IOException { 
     InputStream is = new URL(urlSpec).openStream(); 
     try { 
      return BitmapFactory.decodeStream(is); 
     } finally { 
      is.close(); 
     } 
    } 

    protected void onPostExecute(Bitmap bitmap) { 
     if (bitmap != null) { 
      ImageView iv = (ImageView) findViewById(R.id.myImage); 
      iv.setImageBitmap(bitmap); 
     } 
    } 
}.execute("http://example.com/myimage.jpg");