Calculate the empty area of a linear layout

Question

I want to construct a generic function which receives a LinearLayout (or another view) and calculate the empty space left in it, so i know how many space i've to fit something into it

The main purpose of it is to set ads, example:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:ads="http://schemas.android.com/apk/res-auto"

    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/mainView"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"

    tools:context=".activity.MainActivity">


        <TextView
            android:layout_width="match_parent"
            android:layout_height="@dimen/profilePhotoRadius"
 />

        <TextView
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginBottom="@dimen/smallMargin"
            android:layout_marginTop="@dimen/smallMargin"
 />
<!-- bunch of other stuff here -->
        <com.google.android.gms.ads.AdView
            android:id="@+id/adView"
            android:layout_width="match_parent"
            android:layout_height="0dp"
            android:layout_weight="1"
            android:layout_alignParentBottom="true"/>
</LinearLayout>

then after in my code

   @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
 this.adView = (AdView) findViewById(R.id.adView);
        if (this.adView != null) {


            int width =   this.adView.getMeasuredWidth();
            int height = this.adView.getHeight();
}

but running this code width and height are always zero... i tried to use getWidth() and result is always zero

how can i get the real value?

At onCreate while inflation is not finished all sizes are 0, they only have values after onLayout/onMeasure, check if the viewtreeobserver solution works for you https://stackoverflow.com/questions/8418868/how-to-know-when-an-activity-finishes-a-layout-pass — Marcos Vasconcelos, Jul 10 '18 at 17:54

SynAck · Accepted Answer · 2018-07-10T18:06:45.320

In OnCreate() you are are just inflating the layout. The UI has not been sized and laid out on the screen yet.You are calling getWidth() and getHeight() too early. You can try this:

 @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
 this.adView = (AdView) findViewById(R.id.adView);
 this.adView.getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
        @Override
        public void onGlobalLayout() {
            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) {
                touchView.getViewTreeObserver().removeOnGlobalLayoutListener(this);
            }
            else {
                touchView.getViewTreeObserver().removeGlobalOnLayoutListener(this);
            }

             float Width = this.adView.getWidth();
             float Height =this.adView.getHeight();
            ...
        }
    });

weird questions.... is there any way to do that without the `adview` in the xml? if i put all my stuff inside linear layout is there a way to get just the space left? — Rafael Lima, Jul 10 '18 at 20:03

score 0 · Answer 2 · answered Jul 10 '18 at 17:49

0

Try it in onWindowFocusChanged (boolean hasFocus) method.
From the documentation:

This is the best indicator of whether this activity is visible to the user

answered Jul 10 '18 at 17:49

Calculate the empty area of a linear layout

2 Answers2