将位图转换为Byte[]&将Byte[]写入文件：illegalArgument异常

Question

 public static void writeBitmapWithCompress(final String localFileName, Bitmap b){
        int bytes = b.getByteCount();

        ByteBuffer buffer = ByteBuffer.allocate(bytes); //Create a new buffer
        b.copyPixelsToBuffer(buffer); //Move the byte data to the buffer
        byte[] array = buffer.array();
       // byte[] encodedString  = Base64.encode(array, Base64.DEFAULT);
        byte[] decodedString = Base64.decode(array, Base64.DEFAULT);
       // Bitmap decodedByte = BitmapFactory.decodeByteArray(decodedString, 0, decodedString.length);

        Timber.d(">> social localFileName"+ localFileName);
        try {
            FileOutputStream fileOutputStream = new FileOutputStream(localFileName);
            fileOutputStream.write(decodedString);
            fileOutputStream.flush();
            fileOutputStream.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

在这行获取异常-->byte[]decodedString=base64.decode(array,base64.default)；bad base64。是否有其他方法可以不使用任何压缩来完成这项任务？

StackTrace-->

dalvik.system.vmruntime.newnonmovablearray（原生方法）在Android.graphics.bitmapfactory.nativeDecodeStream（原生方法）在Android.graphics.bitmapfactory.decodeStream（原生方法）02-08在Android.graphics.bitmapfactory.decodeStreaminter(bitmapfactory.java:635)i/dalvikvm:
在Android.graphics.bitmapfactory.decodeStreaminal 417)
在nl.changer.socialschools.common.utils.ResizeImage(utils.java:408)
在nl.changer.socialschools.common.utils.uploadPhotos(utils.java:408)
在nl.changer.socialschools.common.utils.uploadPhotos(utils.java:321)在nl.changer.socialschools.asyncPostService.createPost 08Android.os.looper.loop（looper.java:193)02-08 11:41:36.214 Android.os.handlerThread.run（句柄rthread.java:61)

Answer 1

试试这个，

 public void writeBitmapWithCompress(final String localFileName, Bitmap b){

    byte[] image_bytes = getBytes(b);

    try {
        FileOutputStream out = new FileOutputStream(localFileName);
        out.write(image_bytes);
        out.close();

    } catch (Exception e) {
        e.printStackTrace();
    }
}


// convert bitmap to byte array
public static byte[] getBytes(Bitmap bitmap) {
    ByteArrayOutputStream stream = new ByteArrayOutputStream();
    bitmap.compress(Bitmap.CompressFormat.PNG, 0, stream);
    return stream.toByteArray();
}