blocks|key|1010662|text|安卓现在可能支持一个HTTP客户端库，但是对于任何细粒度的控件，你都可以使用URL+&+HttpURLConnection。代码将如下所示：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1010663|URL+connectURL+=+new+URL(<your+URL+goes+here>);
HttpURLConnection+conn+=+(HttpURLConnection)connectURL.openConnection();+

//+do+some+setup
conn.setDoInput(true);+
conn.setDoOutput(true);+
conn.setUseCaches(false);+
conn.setRequestMethod("GET");+

//+connect+and+flush+the+request+out
conn.connect();
conn.getOutputStream().flush();

//+now+fetch+the+results
String+response+=+getResponse(conn);|code-block|syntax|javascript|1010664|在getResponse()看起来像这样的地方，在您的例子中，您将得到一堆二进制数据，您可能希望将StringBuffer更改为字节数组，并以更大的增量对读取进行分块。|1010665|private+String+getResponseOrig(HttpURLConnection+conn)
{
++++InputStream+is+=+null;
++++try+
++++{
++++++++is+=+conn.getInputStream();+
++++++++//+scoop+up+the+reply+from+the+server
++++++++int+ch;+
++++++++StringBuffer+sb+=+new+StringBuffer();+
++++++++while(+(+ch+=+is.read()+)+!=+-1+)+{+
++++++++++++sb.append(+(char)ch+);+
++++++++}+
++++++++return+sb.toString();+
++++}
++++catch(Exception+e)
++++{
+++++++Log.e(TAG,+"biffed+it+getting+HTTPResponse");
++++}
++++finally+
++++{
++++++++try+{
++++++++if+(is+!=+null)
++++++++++++is.close();
++++++++}+catch+(Exception+e)+{}
++++}

++++return+"";
}|1010666|当你在谈论可能很大的图像数据时，在Android中你需要努力的其他事情是确保你尽快释放你的内存，你只有16mb的堆来处理所有的应用程序，它很快就会用完，如果你不善于释放内存资源，GC会让你抓狂的|1010667|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Q|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|S|8|@]|9|@]|A|$]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

There is a an HTTP client library that might be supported in Android now, but for any fine grain control you can use URL &amp; HttpURLConnection. the code will look something like this:

<pre><code>URL connectURL = new URL(&lt;your URL goes here&gt;);
HttpURLConnection conn = (HttpURLConnection)connectURL.openConnection(); 

// do some setup
conn.setDoInput(true); 
conn.setDoOutput(true); 
conn.setUseCaches(false); 
conn.setRequestMethod("GET"); 

// connect and flush the request out
conn.connect();
conn.getOutputStream().flush();

// now fetch the results
String response = getResponse(conn);
</code></pre>

where getResponse() looks something like this, in your case you are getting 
a pile of binary data back you might want to change the StringBuffer to a byte array
and chunk the reads by a larger increment.

<pre><code>private String getResponseOrig(HttpURLConnection conn)
{
 InputStream is = null;
 try 
 {
 is = conn.getInputStream(); 
 // scoop up the reply from the server
 int ch; 
 StringBuffer sb = new StringBuffer(); 
 while( ( ch = is.read() ) != -1 ) { 
 sb.append( (char)ch ); 
 } 
 return sb.toString(); 
 }
 catch(Exception e)
 {
 Log.e(TAG, "biffed it getting HTTPResponse");
 }
 finally 
 {
 try {
 if (is != null)
 is.close();
 } catch (Exception e) {}
 }

 return "";
}
</code></pre>

As you are talking about image data which can be large, other things you need to be assiduous about in Android is making sure you release your memory as soon as you can, you've only got 16mb of heap to play with for all apps and it runs out fast and the GC will drive you nuts if you aren't really good about giving back memory resources

blocks|key|5588253|text|您可以使用以下代码下载镜像：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|5588254|URLConnection+connection+=+uri.toURL().openConnection();
connection.connect();
InputStream+is+=+connection.getInputStream();
BufferedInputStream+bis+=+new+BufferedInputStream(is,+8+*+1024);
Bitmap+bmp+=+BitmapFactory.decodeStream(bis);
bis.close();
is.close();+|code-block|syntax|javascript|5588255|在AndroidManifest.xml中需要以下权限：|5588256|<uses-permission+android:name="android.permission.INTERNET"+/>|5588257|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

You can use the following code to download an image:

<pre><code>URLConnection connection = uri.toURL().openConnection();
connection.connect();
InputStream is = connection.getInputStream();
BufferedInputStream bis = new BufferedInputStream(is, 8 * 1024);
Bitmap bmp = BitmapFactory.decodeStream(bis);
bis.close();
is.close(); 
</code></pre>

Requires the following permission in AndroidManifest.xml:

<pre><code>&lt;uses-permission android:name="android.permission.INTERNET" /&gt;
</code></pre>

blocks|key|3270247|text|别忘了给应用程序连接到Web的权限，|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3270248|在AndroidManifest.xml中：|3270249|<uses-permission+android:name="android.permission.INTERNET"+/>|code-block|syntax|javascript|3270250|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|L|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|M|8|@]|9|@]|A|$G|H]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

Dont forget to give the app the permission to connect to the Web,

in the AndroidManifest.xml:

<pre><code>&lt;uses-permission android:name="android.permission.INTERNET" /&gt;
</code></pre>

Given a Url for an image, I want to downoload it and paste it onto my canvas in android. How do I retrieve the image into my app ?

Please help.

Thanks,
de costo.

How to work with an image using url in android?

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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给定一个图片的Url，我想下载它并将其粘贴到我的android画布上。如何将图像检索到我的应用程序？请帮帮忙。谢谢，德塞罗。

问如何在android中使用url处理图像？
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问如何在android中使用url处理图像？EN