I want to show images using drawBitmap() method. But before I want to resize it according screen dimensions. I have a problem with quality of result image. You can see screenshots and test code below. How can I resize images in runtime with a good quality?
Thank you for solutions.
Original image: alt text http://dl.dropbox.com/u/709109/gradient.png
Result screenshot on device: alt text http://dl.dropbox.com/u/709109/device.png
import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Rect;
import android.os.Bundle;
import android.view.View;
import android.widget.LinearLayout;
import java.io.IOException;
import java.io.InputStream;
public class MyActivity extends Activity {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
LinearLayout container = (LinearLayout) findViewById(R.id.container);
container.addView(new View(this) {
@Override
protected void onDraw(Canvas canvas) {
Bitmap unscaledBitmap;
try {
InputStream in = getAssets().open("images/gradient.png");
unscaledBitmap = BitmapFactory.decodeStream(in);
in.close();
canvas.drawBitmap(unscaledBitmap, null, new Rect(0, 0, 320, 480), null);
} catch (IOException e) {
e.printStackTrace();
}
}
});
}
}
Instead of resizing at drawing time (which is going to be very costly), try to resize in an offscreen bitmap and make sure that Bitmap is 32 bits (ARGB888).