CODEWITHSUNDEEP
androidandroid-linearlayoutdimensions
Rafael Lima
Rafael Lima

Reputation: 3535

Calculate the empty area of a linear layout

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?

Upvotes: 2

Views: 226

Answers (2)

SynAck
SynAck

Reputation: 427

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();
            ...
        }
    });

Upvotes: 2

user8959091
user8959091

Reputation:

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

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

Upvotes: 0

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