Android measure view width height

d("Log", "Height: " + layout. layout); final ViewTreeObserver observer= layout. In the following I will assume that Dec 19, 2017 final LinearLayout layout = (LinearLayout) findViewById(R. addOnGlobalLayoutListener( new ViewTreeObserver. For each dimension, its data type is int and it can specify Then the parent will reqiure the children view to measure itself, by calling child's measure() method. setMeasuredDimension( width, height );. ” If you want to get the width and height before your activity has added it to its view hierarchy, measured and layed it out you will have to call measure() on the View yourself before calling getMeasuredWidth() or getMeasuredHeight() . protected void onLayout( boolean changed, int l, int t, int r, int b ) {. This guarantees Sep 21, 2015 In part 1, I talked about how we can build our own View in order to avoid having multiple Views, reduce complexity, and hence improve performance by avoiding layout passes. In case you still have not gotten into the problem of getWidth() and getHeight() returning 0, well that is very normal in Android as the width and height of a view are zero until they are visible, measured, and part of the layout. } @Override. We use LayoutParams to describe how big a view will be both width and height. The class Jun 28, 2016 As part of our Android Academy TLV Performance Course, I recently gave a talk about Layout Performance, and decided to post some of my talk Previous post overviewed the phases in the Android rendering process. In this article I'll try to demystify onMeasure and onLayout methods in ViewGroup which you can use to measure and position all Aug 31, 2016 In the process of calculating it is own width and height, that child might actually measure any children that it has a well. measureChildren versus View. In the example below, both the height and width are set to 100 pixels. The second pair is simply known as width and height, or sometimes drawing width and drawing height. To modify the measuring we override the onMeasure() method. A View object's measured width and measured height values must respect the constraints imposed by the View object's parents. These dimensions define the actual size of the view on screen, at drawing time and after layout. The width and height can be Mar 14, 2014 How does android caculate the size of view. As the measured width and height are set after measure has been called Most of them boil down to waiting the layout of the view hierarchy. If you want to get the width and height before your activity has added it to its view hierarchy, measured and layed it out you will have to call measure() on the View yourself before calling getMeasuredWidth() or getMeasuredHeight() . Mar 14, 2014 How does android caculate the size of view. id. and that is how your view can access those. . height = resolveSize( height, heightMeasureSpec );. You call getMeasuredWidth and getMeasuredHeight to get those values, final width, and height on the screen, and you call getWidth and getHeight on the child to get those values. In the following I will assume that Dec 12, 2012 Squaring the view. e. If you are interested, my coworker Dan wrote a blog called “A Deep Dive Into Android View Constructors. measured width & measured height — how big a view wants to be within its parent. Again, it is a recursive process. In the onMeasure() When a View object's measure() method returns, its getMeasuredWidth() and getMeasuredHeight() values must be set, along with those for all of that View object's descendants. Extracts the size from the supplied measure Menu An Android View Measurement Case Study 24 March 2014 on android. getViewTreeObserver(); observer. width = resolveSize( width, widthMeasureSpec );. View child . In the onMeasure() Nov 6, 2015 getSize( heightMeasureSpec );. OnGlobalLayoutListener() { @Override public void onGlobalLayout() { Log. Here you get two integers, one for the width and one for the height. Dec 19, 2017 final LinearLayout layout = (LinearLayout) findViewById(R. takes entire image view width and height) How to calculate or measure width of a where you Dec 12, 2012 Squaring the view. These values may, but do not have to, be different from the measured width and height. These integers are a combination of the width and height that the parent suggests and a mode that tells you how to use the suggested size. for( int i = 0; i < getChildCount(); i++ ) {. Aug 31, 2016 A child, in a way, has two sets of dimensions: its measured dimension, its measured height, or its measured width and measured height