CODEWITHSUNDEEP
androidbitmap
suku
suku

Reputation: 10929

Bitmap height not matching ImageView height even though set to same value

I have a cardview with an ImageView aligned to bottom left.

enter image description here

I am getting the height of the ImageView and setting it as the height of the bitmap.

iv.getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
        @Override
        public void onGlobalLayout() {
            int height = iv.getMeasuredHeight();

            Paint widthPaint = new Paint();
            widthPaint.setTextSize(200f);
            float width = widthPaint.measureText(text);

            Bitmap bmOverlay = Bitmap.createBitmap((int) width + S.dpToPx(ctx, 20), height, Bitmap.Config.ARGB_8888);
            Canvas canvas = new Canvas(bmOverlay);
            Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG);
            paint.setStyle(Paint.Style.FILL);
            canvas.drawColor(Color.argb(220, 244, 244, 244));
            paint.setColor(Color.TRANSPARENT);
            paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC));
            paint.setTextSize(200f);
            paint.setTextAlign(Paint.Align.CENTER);

            canvas.drawText(text, canvas.getWidth() / 2, (canvas.getHeight() / 2) - ((paint.descent() + paint.ascent()) / 2), paint);

            iv.setImageBitmap(bmOverlay);
        }
    });

The output of both iv.getMeasuredHeight(); and bmOverlay.getHeight() is 120. But the bitmap is not covering the ImageView. I cannot understand why.

XML of the ImageView.

 <ImageView
            android:id="@+id/rquiz_iv_topic"
            android:layout_width="80dp"
            android:layout_height="40dp"
            android:layout_alignParentBottom="true"
            android:layout_alignParentLeft="true"/>

Upvotes: 0

Views: 523

Answers (2)

nyconing
nyconing

Reputation: 1136

What you want to archive: Set ImageView exactly size with the Bitmap is something wrong.

You needs to fits all the phone screen instead of settings it View by pixel.

You can:

1. Respect Parent Way: Put ImageView in LinearLayout, Set Weight as 0.5 (means fits 50% of LinearLayout), and set related (Vertical or Horizontal) Height or Width to 0dp(to let Layout Manager to handles the size).

And, set your image scale to fitXY / centerCrop.(Or you can try other scaling)

2.Respect Bitmap Way: Put ImageView in RelativeLayout, set other nearby Views to stand with ImageView by layout_alignBottom/layout_alignLeft etc. And set ImageView Height and/or Width to wrap_content, let the Layout handles the size.

Upvotes: 1

Sasi Kumar
Sasi Kumar

Reputation: 13358

In your imageview set scaleType="centerInside" and adjustViewBounds="true".

      <ImageView
        android:id="@+id/rquiz_iv_topic"
        android:layout_width="80dp"
        android:layout_height="40dp"
        android:layout_alignParentBottom="true"            
        android:layout_alignParentLeft="true"
        android:adjustViewBounds="true"
        android:scaleType="centerInside"
        />

Refer for more details ImageView.ScaleType

Upvotes: 0

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