Android-将图片定位在准确的位置

Question

I am trying to position an image in my android app so that it will display in the middle of the width of screen and lower part of the height of the screen. I need it to look like this.

My image is 200x50, so I used following logic to achieve this.

Display display = ((Activity)context).getWindowManager().getDefaultDisplay();
screenWidth = display.getWidth();
screenHeight = display.getHeight();
canvas.drawBitmap(BitmapFactory.decodeResource(getResources(), R.drawable.play), screenWidth/2 - 100, 3*screenHeight/4 - 25, null);

But still I am not getting located at correct place and I am getting it like this.

What I am doing wrong here? How can I do this?

Answer 1

Can you try this

Display display = ((Activity)context).getWindowManager().getDefaultDisplay();
screenWidth = display.getWidth();
screenHeight = display.getHeight();
Bitmap playImage = BitmapFactory.decodeResource(getResources(), R.drawable.play);
canvas.drawBitmap(playImage, (screenWidth/2) - (playImage.getWidth()/2), 3*screenHeight/4 - 25, null);

Answer 2

why there is an need to write java code for this ?

just specify properties from xml.

center horizontal = true and margin bottom = "some value"

its done

Answer 3

Try this

alignParentBottom - true
centerHorizontal - true
marginBottom (Calculate 15% of height and set it)