How to scale an Image in ImageView to keep the aspect ratio

Question

In Android, I defined an ImageView\'s layout_width to be fill_parent (which takes up the full width of the phone).

If the imag

Answer 1

You can calculate screen width. And you can scale bitmap.

 public static float getScreenWidth(Activity activity) {
        Display display = activity.getWindowManager().getDefaultDisplay();
        DisplayMetrics outMetrics = new DisplayMetrics();
        display.getMetrics(outMetrics);
        float pxWidth = outMetrics.widthPixels;
        return pxWidth;
    }

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calculate screen width and scaled image height by screen width.

float screenWidth=getScreenWidth(act)
  float newHeight = screenWidth;
  if (bitmap.getWidth() != 0 && bitmap.getHeight() != 0) {
     newHeight = (screenWidth * bitmap.getHeight()) / bitmap.getWidth();
  }

After you can scale bitmap.

Bitmap scaledBitmap=Bitmap.createScaledBitmap(bitmap, (int) screenWidth, (int) newHeight, true);