Scale Bitmap using drawBitmap

Question

Basically I have 640 x 480 image and I want to scale and draw it using drawBitmap. For simplicity lets just say I have 854 x 480 android screen. Here is my code

MainActivity.java

public class MainActivity extends Activity
{
  @Override
  public void onCreate(Bundle savedInstanceState)
  {
    super.onCreate(savedInstanceState);
    setContentView(new MainLayout(this));
  }
}
class MainLayout extends RelativeLayout
{
  public MainLayout(Context context)
  {
    super(context);
    setWillNotDraw(false);
  }
  @Override
  public void onDraw(Canvas canvas)
  {
    super.onDraw(canvas);
    Bitmap bitmap = BitmapFactory.decodeResource(getResources(), R.drawable.background);
    bitmap = Bitmap.createScaledBitmap(bitmap, 854, 480, true);
    canvas.drawBitmap
    (
      bitmap,
      null,
      new Rect(0, 0, 854, 480),
      null
    );
  }
}

The result is different than what I want. Any suggestion?

Just a note. If you want simply a square result, whether you need to scale up or down, use this incredibly handy tip ... stackoverflow.com/a/17733530/294884 — Fattie
– Fattie, Commented Jun 2, 2014 at 13:42

Shyam · Accepted Answer · 2013-12-27 07:29:49Z

7

use this

Paint paint = new Paint();
paint.setAntiAlias(true);
paint.setFilterBitmap(true);
paint.setDither(true);

canvas.drawBitmap(bitmap, x, y, paint);

answered Dec 27, 2013 at 7:29

Shyam

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1 Comment

Yev Kanivets Over a year ago

Really good answer, I had bad bitmaps after scaling by matrix without paint.setDither(true), but now everything is perfect.

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