Question

I download image with this code:

ImageGetter imageGetter =newImageGetter(){@OverridepublicDrawable getDrawable(String source){Drawable drawable =null;try{
            URL url =new URL(source);String path =Environment.getExternalStorageDirectory().getPath()+"/Android/data/com.my.pkg/"+url.getFile();File f=newFile(path);if(!f.exists()){URLConnection connection = url.openConnection();InputStreamis= connection.getInputStream();

                f=newFile(f.getParent());
                f.mkdirs();FileOutputStream os =newFileOutputStream(path);byte[] buffer =newbyte[4096];int length;while((length =is.read(buffer))>0){
                    os.write(buffer,0, length);}
                os.close();is.close();}
            drawable =Drawable.createFromPath(path);}catch(MalformedURLException e){
            e.printStackTrace();}catch(Throwable t){
            t.printStackTrace();}if(drawable !=null){
            drawable.setBounds(0,0, drawable.getIntrinsicWidth(), drawable.getIntrinsicHeight());}return drawable;}};

This image has size 20x20. But drawable.getIntrinsicWidth() and drawable.getIntrinsicHeight() return 27. And image looks larger. How I can fix it?

Accepted Answer

BitmapDrawable must scale bitmap to compensate for different screen densities.

If you need it to draw pixel-for-pixel, try setting Drawable's source density & target density to same value. To do this, you need slightly different objects to work with.

Instead of

drawable =Drawable.createFromPath(path);

use

Bitmap bmp =BitmapFactory.decodeFile(path);DisplayMetrics dm = context.getResources().getDisplayMetrics();
bmp.setDensity(dm.densityDpi);
drawable =newBitmapDrawable(bmp, context.getResources());

If you don't have context (which you should), you can use application context, see e.g. Using Application context everywhere?

Since bitmap's density is set to resources' density, which is actual device's screen's density, it should draw without scaling.

Wrong size from Drawable.getIntrinsicWidth()

1 Answer