Android - Positioning an image at exact location

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?

have look at the examples: http://stackoverflow.com/questions/3294590/set-the-absolute-position-of-a-view — Riad, Aug 11 '16 at 04:52

score 1 · Accepted Answer · answered Aug 11 '16 at 05:15

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);

answered Aug 11 '16 at 05:15

Progen

129
8

That's what I have done, isn't it? playImage.getWidth()/2 is 100. – Chamila Wijayarathna Aug 11 '16 at 05:17
1

Can you try to print playImage.getWidth()/2? Is it really coming as 100? – Progen Aug 11 '16 at 05:28
It worked and playImage.getWidth()/2 is 262, not 100, what is the reason for that? – Chamila Wijayarathna Aug 11 '16 at 05:35
1

With the screen density ratio the image dimension might vary – Progen Aug 11 '16 at 06:13

score 0 · Answer 2 · answered Aug 11 '16 at 04:46

0

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

answered Aug 11 '16 at 04:46

Dnyanesh

331
3
12

Hi, I'm very new to this, I don't have an xml file like you have mentioned, I created a GamePanle object extending SurfaceView and added the code I mentioned there. Where should I add an xml code to do this and how should I refer to it? – Chamila Wijayarathna Aug 11 '16 at 04:50
Its definitely not 'done'. Not with `margin_bottom` above, mainly because most `ViewGroup` classes align their children to top-left – Shaishav Aug 11 '16 at 04:50
@ChamilaWijayarathna - Also keep in mind that you can achieve programmatically what you can in XML ... I'd suggest attempting use of XML for layout in most cases for style and separating view from logic as much as possible. In code, I believe "center horizontal" is related to "gravity" on layout items, and margins should be available on most (if not all) widgets and views. – Del Aug 11 '16 at 04:55

score 0 · Answer 3 · answered Aug 11 '16 at 04:57

0

Try this

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

answered Aug 11 '16 at 04:57

Viswanath Lekshmanan

9,945
1
40
64

Hi, I don't get this, should I do this in java code? – Chamila Wijayarathna Aug 11 '16 at 05:02
Try to set the same using `LayoutParams` – Viswanath Lekshmanan Aug 11 '16 at 05:04
Just google it, eg link http://stackoverflow.com/questions/9678785/android-setting-layoutparams-programmatically – Viswanath Lekshmanan Aug 11 '16 at 05:19

Android - Positioning an image at exact location

3 Answers3