android - 位图的大小和方向不正确

Question

我正在尝试在ImageView中显示位图。使用Camera2 API，我在ImageReader上找到了ImageReader.OnImageAvailableListener。然后，我从图像创建一个位图：

private final ImageReader.OnImageAvailableListener mOnImageAvailableListener = new
        ImageReader.OnImageAvailableListener() {
            @Override
            public void onImageAvailable(ImageReader reader) {
                mBackgroundHandler.post(new ImageSaver(reader.acquireLatestImage()));
            }
        };
private class ImageSaver implements Runnable {

    private final Image mImage;

    public ImageSaver(Image image) {
        mImage = image;
    }

    @Override
    public void run() {
        ByteBuffer byteBuffer = mImage.getPlanes()[0].getBuffer();
        byte[] bytes = new byte[byteBuffer.remaining()];
        byteBuffer.get(bytes);
        // need to set the bitmap the size of the screen
        final Bitmap bitmap = BitmapFactory.decodeByteArray(bytes, 0, bytes.length);

        runOnUiThread(new Runnable() {
            @Override
            public void run() {
                imageView.setImageBitmap(bitmap);
            }
        });

从屏幕截图中可以看出，位图不会填满整个屏幕，而是横向而不是纵向。我的ImageView看起来像这样：

<ImageView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:id="@+id/imageView"
        android:layout_alignParentTop="true"
        android:layout_alignParentStart="true" />

它的父级是RelativeLayout，它会填满整个屏幕。那我在做什么错？

Answer 1

使用Android Matrix类对我的情况有所帮助：

                ByteBuffer byteBuffer = mImage.getPlanes()[0].getBuffer();
                byte[] bytes = new byte[byteBuffer.remaining()];
                byteBuffer.get(bytes);
                final Bitmap bitmap = BitmapFactory.decodeByteArray(bytes, 0, bytes.length);

                Matrix matrix = new Matrix();
                matrix.postRotate(90);
                Bitmap scaledBitmap = Bitmap.createScaledBitmap(bitmap,mImage.getWidth(),mImage.getHeight(),true);
                Bitmap rotatedBitmap = Bitmap.createBitmap(scaledBitmap , 0, 0, scaledBitmap .getWidth(), scaledBitmap .getHeight(), matrix, true);

任何人都可以建议我这是一个好的解决方案，还是可以重构此代码？