图像未创建使用BitmapFactory.de codeByteArray [英] Image isn't creating using the BitmapFactory.decodeByteArray

问题描述

编辑： 当我保存这些字节txt文件，当我把它保存为PNG文件时，它显示的图像，但它不能在这里工作，为什么......？

我用这code，创建从字节数组图像 在doInBackground（）

 字符串base64data = StringEscapeUtils.unescapeJava（IOUtils.toString（resp.getEntity（）的getContent（）））;
             base64data = base64data.substring（1，base64data.length（） -  1）;
             JSONObject的OBJ =新的JSONObject（base64data）;
             JSONArray阵列= obj.getJSONArray（EMRTable）;
             的JSONObject childobj = array.getJSONObject（0）;
             结果= childobj.getString（DocumentInternalFormat）;
 

和onPostExecute

 如果（jsondata！= NULL）
     {
         receiveData（jsondata）;
     }
 

有一个在logcat中没有出现错误，即使存在在it..but也不例外的图像没有显示。我也做了这样的

 字符串数据=（字符串）对象;
                数据= data.trim（）;
                byte []的base64converted = Base64.de code（数据，Base64.DEFAULT）;
//
                BMP位= BitmapFactory.de codeByteArray（base64converted，0，base64converted.length）;
//文件根= android.os.Environment.getExternalStorageDirectory（）;
//文件DIR =新的文件（root.getAbsolutePath（）+/下载）;
//档案文件=新的文件（目录，姓名）;
// FileOutputStream中F =新的FileOutputStream（文件）;
// f.write（base64converted）;
// f.flush（）;

                ImageView的形象=新ImageView的（上下文）;
                image.setImageBitmap（BMP）;
                的setContentView（图像）;
 

但结果相同的图像无法显示，但没有异常或错误，这是什么问题...

注释行是当我尝试这些字节保存成文本文件，当我拉的文件，它显示了Windows默认的图像浏览器中的图像。

解决方案

试试这个code，同时获得来自不同资源的位图...

  BitmapFactory.Options选项=新BitmapFactory.Options（）;
            options.inJustDe codeBounds = TRUE;
            BitmapFactory.de codeByteArray（base64converted，0，base64converted.length，期权）;

            //计算inSampleSize
            options.inSampleSize = calculateInSampleSize（选项，500，500）;
            与inSampleSize集//德code位图
            options.inJustDe codeBounds = FALSE;
            位图BMP1 = BitmapFactory.de codeByteArray（base64converted，0，base64converted.length，期权）;
 

遵循href="http://developer.android.com/training/displaying-bitmaps/index.html" rel="nofollow">高效的方式来显示位图 <此链接

Edit: When I save those bytes in the txt file and when I save it as png file , it shows the image, but it is not working here why...?

I am using this code to create image from byte array on doInBackground()

            String base64data=StringEscapeUtils.unescapeJava(IOUtils.toString(resp.getEntity().getContent()));
             base64data=base64data.substring(1,base64data.length()-1);
             JSONObject obj=new JSONObject(base64data);
             JSONArray array=obj.getJSONArray("EMRTable");
             JSONObject childobj=array.getJSONObject(0);
             results=childobj.getString("DocumentInternalFormat");

and onPostExecute

   if(jsondata!=null)
     {
         receiveData(jsondata);
     }

There is no error in the logcat, even there is no exception in it..but the image isn't showing. I have also did like this

            String data=(String)object;
                data=data.trim();
                byte[] base64converted=Base64.decode(data,Base64.DEFAULT);
//              
                Bitmap bmp=BitmapFactory.decodeByteArray(base64converted,0,base64converted.length);
//                File root = android.os.Environment.getExternalStorageDirectory(); 
//                File dir = new File (root.getAbsolutePath() + "/download");
//                  File file = new File(dir, "name");
//                  FileOutputStream f = new FileOutputStream(file);
//                 f.write(base64converted);
//                 f.flush();

                ImageView image=new ImageView(context);
                image.setImageBitmap(bmp);
                setContentView(image);

but the result same image isn't showing but there is no exception or an error, what is the problem...

The commented lines are when I try to store those bytes into text file and when I pull the file, it shows the images with windows default image viewer.

解决方案

Try this code while getting bitmap from different resources...

            BitmapFactory.Options options = new BitmapFactory.Options();
            options.inJustDecodeBounds = true;
            BitmapFactory.decodeByteArray(base64converted,0,base64converted.length,options);

            // Calculate inSampleSize
            options.inSampleSize = calculateInSampleSize(options, 500, 500);
            // Decode bitmap with inSampleSize set
            options.inJustDecodeBounds = false;
            Bitmap bmp1=BitmapFactory.decodeByteArray(base64converted,0,base64converted.length,options);

follow the tutorial on this link Efficient way to show bitmaps

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