getHeight returns 0 for all Android UI objects

Question

I'm building a UI, and it's all static defined in the XML. All of it has weights all over the place, and while it looks right, I wanted to see that things actually have the right height and all. The problem is that no matter where I call .getHeight() for my format layout I got 0. I tried in both onCreate() and onStart(). Same thing. Happens for all UI objects too. Any idea?

package com.app.conekta;

import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.view.Window;
import android.widget.Button;
import android.widget.FrameLayout;
import android.widget.Toast;

public class Conekta extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        requestWindowFeature(Window.FEATURE_NO_TITLE);
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

    }

    @Override
    public void onStart() {

        super.onStart();


    }

    @Override
    public void onResume() {
        super.onResume();

        FrameLayout fl1 = (FrameLayout) findViewById(R.id.headerFrameLayout);
        FrameLayout fl2 = (FrameLayout) findViewById(R.id.footerFrameLayout);
        Button b=(Button) findViewById(R.id.searchButton);

        Log.d("CONEKTA", String.valueOf(b.getHeight()));

    }
}

XML:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >



    <FrameLayout
        android:id="@+id/headerFrameLayout"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_weight="0.05"
        android:background="#597eAA" >

        <ImageView
            android:id="@+id/logoImage"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:background="#7ba1d1"
            android:src="@drawable/logo_conekta" />
    </FrameLayout>

    <LinearLayout
        android:id="@+id/bodyLinearLayout"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_weight="0.7"
        android:background="#f3f3f3"
        android:orientation="horizontal" >

        <FrameLayout
            android:id="@+id/leftBlankFrameLayout"
            android:layout_width="wrap_content"
            android:layout_height="fill_parent"
            android:layout_weight="0.15"
            android:background="#f3f3f3" >
        </FrameLayout>

        <LinearLayout
            android:id="@+id/centerVerticalLayout"
            android:layout_width="wrap_content"
            android:layout_height="fill_parent"
            android:layout_weight="0.7"
            android:orientation="vertical" >

            <FrameLayout
                android:id="@+id/topCenterFrameLayout"
                android:layout_width="fill_parent"
                android:layout_height="wrap_content"
                android:layout_weight="0.35" >
            </FrameLayout>

            <TextView
                android:id="@+id/venueLabel"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_weight="0.025"
                android:text="What are you looking for?"
                android:textAppearance="?android:attr/textAppearanceMedium"
                android:textColor="#000000" />

            <EditText
                android:id="@+id/venueTextField"
                android:layout_width="fill_parent"
                android:layout_height="wrap_content"
                android:layout_weight="0.025" >

                <requestFocus />
            </EditText>

            <FrameLayout
                android:id="@+id/middleCenterFrameLayout"
                android:layout_width="fill_parent"
                android:layout_height="wrap_content"
                android:layout_weight="0.05" >
            </FrameLayout>

            <TextView
                android:id="@+id/locationLabel"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_weight="0.025"
                android:text="Where?"
                android:textAppearance="?android:attr/textAppearanceMedium"
                android:textColor="#000000" />

            <AutoCompleteTextView
                android:id="@+id/locationTextField"
                android:layout_width="fill_parent"
                android:layout_height="wrap_content"
                android:layout_weight="0.025"
                android:text="" />

            <LinearLayout
                android:id="@+id/buttonLinearLayout"
                android:layout_width="fill_parent"
                android:layout_height="wrap_content"
                android:layout_weight="0.05"
                android:background="#f3f3f3"
                android:orientation="horizontal" >

                <FrameLayout
                    android:id="@+id/leftButtonLinearLayout"
                    android:layout_width="wrap_content"
                    android:layout_height="fill_parent"
                    android:layout_weight="0.1" >
                </FrameLayout>

                <Button
                    android:id="@+id/searchButton"
                    android:layout_width="wrap_content"
                    android:layout_height="fill_parent"
                    android:layout_weight="0.8"
                    android:background="#6fa8dc"
                    android:text="Search" />

                <FrameLayout
                    android:id="@+id/rightButtonLinearLayout"
                    android:layout_width="wrap_content"
                    android:layout_height="fill_parent"
                    android:layout_weight="0.1" >
                </FrameLayout>
            </LinearLayout>

            <FrameLayout
                android:id="@+id/bottomCenterFrameLayout"
                android:layout_width="fill_parent"
                android:layout_height="wrap_content"
                android:layout_weight="0.35" >
            </FrameLayout>
        </LinearLayout>

        <FrameLayout
            android:id="@+id/rightBlankFrameLayout"
            android:layout_width="wrap_content"
            android:layout_height="fill_parent"
            android:layout_weight="0.15"
            android:background="#f3f3f3" >
        </FrameLayout>
    </LinearLayout>

    <FrameLayout
        android:id="@+id/footerFrameLayout"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_weight="0.15"
        android:background="#7ba1d1" >
    </FrameLayout>

</LinearLayout>

Answer 1

It's 0 because in both onCreate and onStart, the view hasn't actually been drawn yet. You can get around this by listening for when the view is actually drawn:

final TextView tv = (TextView)findViewById(R.id.venueLabel);
final ViewTreeObserver observer= tv.getViewTreeObserver();
       observer.addOnGlobalLayoutListener(new OnGlobalLayoutListener() {
            @Override
            public void onGlobalLayout() {
              tv.getHeight()
              observer.removeGlobalOnLayoutListener(this);
            }
        });

The call to remove the listener is there to prevent repeated invocations of your custom handler on layout changes... if you want to get those, you can omit it.

Answer 2

In short, the views are not built yet in onCreate(), onStart(), or onResume(). Since they technically don't exist (as far as the ViewGroup is concerned), their dimensions are 0.

In long, you can go here for a better explanation on how to handle it.

How to retrieve the dimensions of a view?

Answer 3

Use this function to get Height or Width of View

private int getHeightOfView(View contentview) {
    contentview.measure(View.MeasureSpec.UNSPECIFIED, View.MeasureSpec.UNSPECIFIED);
    //contentview.getMeasuredWidth();
    return contentview.getMeasuredHeight();
}