图像不是使用 BitmapFactory.decodeByteArray 创建的 [英] Image isn't creating using the BitmapFactory.decodeByteArray

问题描述

当我将这些字节保存在 txt 文件中并将其另存为 png 文件时，它会显示图像，但它在这里不起作用，为什么...?

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...?

我正在使用此代码从字节数组创建图像在 doInBackground() 上

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");

和 onPostExecute

and onPostExecute

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

logcat 中没有错误，即使其中也没有异常......但图像没有显示.我也做过这样的

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);          

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

但结果相同的图像没有显示但没有异常或错误，这是什么问题...

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

注释行是当我尝试将这些字节存储到文本文件中时，当我拉出文件时，它会使用 Windows 默认图像查看器显示图像.

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.

推荐答案

在从不同资源获取位图时尝试此代码...

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);

按照此链接上的教程显示位图的有效方法

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