UrlEncodedFormEntity与图像时内存不足

Question

我试图发送数据到服务器。也就是说，一些字符串字段和图像，该图像被编码为base64并作为这样一个字符串传递：

ByteArrayOutputStream stream = new ByteArrayOutputStream(); 
     mBitmap.compress(Bitmap.CompressFormat.JPEG, 100, stream); 
     byte[] byteArray = stream.toByteArray(); 
     //Cleaning memory 
     try { 
      stream.close(); 
      stream = null; 
     } catch (IOException e) { 
      // TODO Auto-generated catch block 
      e.printStackTrace(); 
     } 
     //Eecode base64 
     nameValuePairs.add(new BasicNameValuePair(DatosDB.KEY_IMG, Base64.encodeToString(byteArray, Base64.DEFAULT))); 
     byteArray = null; 

然后，制备HTTP PUT请求时：

try{ 
     HttpClient httpclient = new DefaultHttpClient(); 
     //PUT 
     HttpPut httpput = new HttpPut(KEY_121 + ruta); 
     //The exception is thrown when executing next instruction 
     httpput.setEntity(new UrlEncodedFormEntity(nameValuePairs)); 
     HttpResponse response = httpclient.execute(httpput); 

     HttpEntity entity = response.getEntity(); 
     is = entity.getContent(); 

     }catch(Exception e){ 
     Log.e(TAG, "Error in http connection "+e.toString()); 
     } 

误差长相像这样：

12-20 00:24:11.622: ERROR/AndroidRuntime(7499): FATAL EXCEPTION: main 
12-20 00:24:11.622: ERROR/AndroidRuntime(7499): java.lang.OutOfMemoryError 
12-20 00:24:11.622: ERROR/AndroidRuntime(7499):  at java.lang.AbstractStringBuilder.enlargeBuffer(AbstractStringBuilder.java:95) 
12-20 00:24:11.622: ERROR/AndroidRuntime(7499):  at java.lang.AbstractStringBuilder.append0(AbstractStringBuilder.java:140) 
12-20 00:24:11.622: ERROR/AndroidRuntime(7499):  at java.lang.StringBuilder.append(StringBuilder.java:125) 
12-20 00:24:11.622: ERROR/AndroidRuntime(7499):  at java.net.URLEncoder.encode(URLEncoder.java:109) 
12-20 00:24:11.622: ERROR/AndroidRuntime(7499):  at org.apache.http.client.utils.URLEncodedUtils.encode(URLEncodedUtils.java:184) 
12-20 00:24:11.622: ERROR/AndroidRuntime(7499):  at org.apache.http.client.utils.URLEncodedUtils.format(URLEncodedUtils.java:163) 
12-20 00:24:11.622: ERROR/AndroidRuntime(7499):  at org.apache.http.client.entity.UrlEncodedFormEntity.<init>(UrlEncodedFormEntity.java:71) 
12-20 00:24:11.622: ERROR/AndroidRuntime(7499):  at com.android.upvar.Http_Request.put(Http_Request.java:171) 
12-20 00:24:11.622: ERROR/AndroidRuntime(7499):  at com.android.upvar.Http_Request.poi(Http_Request.java:108) 
12-20 00:24:11.622: ERROR/AndroidRuntime(7499):  at com.android.upvar.NewPOI.putPOI(NewPOI.java:360) 
12-20 00:24:11.622: ERROR/AndroidRuntime(7499):  at com.android.upvar.NewPOI.access$6(NewPOI.java:325) 
12-20 00:24:11.622: ERROR/AndroidRuntime(7499):  at com.android.upvar.NewPOI$5.onClick(NewPOI.java:157) 
12-20 00:24:11.622: ERROR/AndroidRuntime(7499):  at android.view.View.performClick(View.java:2538) 
12-20 00:24:11.622: ERROR/AndroidRuntime(7499):  at android.view.View$PerformClick.run(View.java:9152) 
12-20 00:24:11.622: ERROR/AndroidRuntime(7499):  at android.os.Handler.handleCallback(Handler.java:587) 
12-20 00:24:11.622: ERROR/AndroidRuntime(7499):  at android.os.Handler.dispatchMessage(Handler.java:92) 
12-20 00:24:11.622: ERROR/AndroidRuntime(7499):  at android.os.Looper.loop(Looper.java:130) 
12-20 00:24:11.622: ERROR/AndroidRuntime(7499):  at android.app.ActivityThread.main(ActivityThread.java:3687) 
12-20 00:24:11.622: ERROR/AndroidRuntime(7499):  at java.lang.reflect.Method.invokeNative(Native Method) 
12-20 00:24:11.622: ERROR/AndroidRuntime(7499):  at java.lang.reflect.Method.invoke(Method.java:507) 
12-20 00:24:11.622: ERROR/AndroidRuntime(7499):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:842) 
12-20 00:24:11.622: ERROR/AndroidRuntime(7499):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:600) 
12-20 00:24:11.622: ERROR/AndroidRuntime(7499):  at dalvik.system.NativeStart.main(Native Method) 
12-20 00:24:11.632: WARN/ActivityManager(3923): Force finishing activity com.android.upvar/.NewPOI 
12-20 00:24:11.636: ERROR/(3923): Dumpstate > /data/log/dumpstate_app_error 

我不明白为什么我会得到这个异常。我只是发送从三星Galaxay相机拍摄的定期图像（肯定不会超过16MB）。任何想法？

编辑：我必须补充说，第一个代码块和第二个代码块位于不同的类中，所以第一块代码中的数据被传递给另一个类的对象，该类将其传递给另一个对象另一个类，它具有HTTP请求。

Answer 1

在结束时，TE的解决办法是将图像压缩到50％，如下所示：

mBitmap.compress(Bitmap.CompressFormat.JPEG, 100, stream); 

它减少了图像尺寸，并使其足够小，以将其发送为一个字符串。

Answer 2

后你做

mBitmap.compress(Bitmap.CompressFormat.JPEG, 100, stream); 
byte[] byteArray = stream.toByteArray(); 

你在内存中的图像的两个版本，一个为位图和一个字节数组英寸通过Bitmap.recycle()清洗前者可能会有所帮助。

未征询意见：用于传输图像的'多部分表单数据'是否不符合您的目的？这非常有效。

Answer 3

对您的实体使用流式处理，以便它仅消耗流请求的小缓冲区大小。 ByteArrayOutputStream保存内存中的所有数据。

HTTPClient - Performance Guide

尝试像下面的实施，这不会产生在存储器中的对象是不必要的。但以下可能不完整实施。玩得开心编码！

class BitMapRequestEntity extends AbstractHttpEntity { 

    private Bitmap bitmap; 

    public BitMapRequestEntity(Bitmap mBitmap) { 
     super(); 
     this.bitmap = mBitmap; 
    } 

    @Override 
    public InputStream getContent() throws IOException, 
      IllegalStateException { 
     // TODO Auto-generated method stub 
     return null; 
    } 

    @Override 
    public long getContentLength() { 
     // TODO Auto-generated method stub 
     return 0; 
    } 

    @Override 
    public boolean isRepeatable() { 
     // TODO Auto-generated method stub 
     return false; 
    } 

    @Override 
    public boolean isStreaming() { 
     return true; 
    } 

    @Override 
    public void writeTo(OutputStream outstream) throws IOException { 
     bitmap.compress(Bitmap.CompressFormat.JPEG, 100, outstream); 
    } 

} 
try { 
    org.apache.http.client.HttpClient httpclient = new DefaultHttpClient(); 
    // PUT 
    HttpPut httpput = new HttpPut(KEY_121 + ruta); 
    // The exception is thrown when executing next instruction 
    httpput.setEntity(new BitMapRequestEntity(mBitmap)); 
    HttpResponse response = httpclient.execute(httpput); 

    HttpEntity entity = response.getEntity(); 
    is = entity.getContent(); 

} catch (Exception e) { 
    Log.e(TAG, "Error in http connection " + e.toString()); 
}