BitmapFactory.DecodereSource为outHeight和Outhidth返回0，其中inJustDecodeBounds=true

Question

我正在学习android开发者关于高效显示位图的教程，我正在尝试阅读位图的尺寸和类型。

BitmapFactory.Options options = new BitmapFactory.Options();
    options.inJustDecodeBounds = true;
    image = BitmapFactory.decodeResource(context.getResources(), R.id.myimage, options);
    imageHeight = options.outHeight;
    imageWidth = options.outWidth;
    imageType = options.outMimeType;

ImageView imgView = (ImageView) findViewById(R.id.myimage);
    Drawable draw = getResources().getDrawable(R.drawable.bmp_login_screen);
    imgView.setImageDrawable(draw);



    TextView textView = (TextView) findViewById(R.id.text_view);

    ReadBitmapDimen dimensions = new ReadBitmapDimen(getApplicationContext());
    textView.setText(" Dimensions for userlogin image: outHeight = " + String.valueOf(dimensions.imageHeight));

谢谢！

Answer 1

更改此行-image=BitmapFactory.DecodereSource（context.getResources(),r.id.MyImage,options）；

至

image = BitmapFactory.decodeResource(context.getResources(), R.drawable.bmp_login_screen, options);