Android: how to set the height/width of the src image of a ImageButton?

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灰色年华
灰色年华 2021-02-13 02:23

Android: how to set the height/width of the image(src image intead of the background) of a ImageButton?

I want to set the height/width of the top level image(not the bac

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  •  难免孤独
    2021-02-13 02:45

    xml

    
    

    EDIT: (java code)

    // load the origial BitMap (500 x 500 px)
        Bitmap bitmapOrg = BitmapFactory.decodeResource(getResources(),
               R.drawable.android);
    
        int width = bitmapOrg.width();
        int height = bitmapOrg.height();
        int newWidth = 200;
        int newHeight = 200;
    
        // calculate the scale - in this case = 0.4f
        float scaleWidth = ((float) newWidth) / width;
        float scaleHeight = ((float) newHeight) / height;
    
        // create a matrix for the manipulation
        Matrix matrix = new Matrix();
        // resize the bit map
        matrix.postScale(scaleWidth, scaleHeight);
        // rotate the Bitmap
        matrix.postRotate(45);
    
        // recreate the new Bitmap
        Bitmap resizedBitmap = Bitmap.createBitmap(bitmapOrg, 0, 0,
                          width, height, matrix, true);
    
        // make a Drawable from Bitmap to allow to set the BitMap
        // to the ImageView, ImageButton or what ever
        BitmapDrawable bmd = new BitmapDrawable(resizedBitmap);
    
        ImageView imageView = new ImageView(this);
    
        // set the Drawable on the ImageView
        imageView.setImageDrawable(bmd);
    
        // center the Image
        imageView.setScaleType(ScaleType.CENTER);
    
        // add ImageView to the Layout
        linLayout.addView(imageView,
                new LinearLayout.LayoutParams(
                      LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT
                )
        );
    

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