我正在关注有关有效显示位图的android开发人员教程,并且尝试读取位图的尺寸和类型.

这是我阅读位图的代码：

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;

我的imageHeight,imageWidth结果似乎都为0,而imageType为null.

该图像是位图格式.

我的onCreate方法是

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！

解决方法:

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);