用字节数组初始化时，位图返回null

Question

I have Bitmap that I'm assigning a byte array value, using code:

public class LegacyCameraManager implements Camera.ErrorCallback, Camera.PreviewCallback, Camera.AutoFocusCallback, Camera.PictureCallback {
public static Bitmap mBitmap;
    @Override
    public void onPreviewFrame(byte[] bytes, Camera camera) {
        Boolean isProcessing = UserSharedPref.initializeSharedPreferencesForprocessFrames(mContext).getBoolean(UserSharedPref.processFrames, true);
        if (isProcessing) {
            Log.d("TEST:","length of bytes:"+bytes.length);
            BitmapFactory.Options options = new BitmapFactory.Options();
            options.inPreferredConfig = Bitmap.Config.ARGB_8888;
            mBitmap = BitmapFactory.decodeByteArray(bytes,0,bytes.length,options);
            Log.d("TEST:","The bitmap:"+mBitmap);
            tfDetector.onPreviewFrame(bytes, camera);

        }
    }

The rest of the code works well and this method gets called continuously like it should, the thing is mBitmap is logging out as "null" always and this variable has to be set to an imageview like this,onclikc of a button like this:

 if (LegacyCameraManager.mBitmap == null) {
            Log.d("TEST:","Bitmaps is NULL!!");
            img.setImageResource(R.drawable.office);
        } else {
            img.setImageBitmap(Bitmap.createScaledBitmap(LegacyCameraManager.mBitmap, img.getWidth(),
                    img.getHeight(), false));
        }

The Logcat (a lot of number of times like it should): length of bytes:460800 The bitmap:null

And therefore, the image is not getting set to the bitmap being null, the actual function is to set the image view to a picture taken at the instant which will happen of the bitmap is assigned like it is supposed to. Where am I going wrong?

Answer 1

Just try this:

Bitmap bitmap = BitmapFactory.decodeByteArray(bitmapdata, 0, bitmapdata.length);

Returns the decoded Bitmap, or null if the image could not be decoded.