android: get viewHeight programmatically

Question

i am trying to get the height of a view and it keeps returning 0.

this is what i have tried:

View hourView = View.inflate(mContext, R.layout.calendar_hour_item,null);
hourViewHeight = hourView.findViewById(R.id.mainLayout).getHeight();

i also tried hourViewHeight = hourView.getHeight(); as well but no joy.

i call those two lines inside a initialize() method located here:

@Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.calendar_day_screen);

        Intent intent = getIntent();

        mDate = new DateTime(intent.getStringExtra("date"));
        circleIcon = (ImageView) findViewById(R.id.circle);

        mHoursLayout = (RelativeLayout) findViewById(R.id.dayLayout);

        TopBarUtil topBar = new TopBarUtil(getApplicationContext());

        circleIcon.setOnClickListener(topBar.onActionClickListener());

        mContext = getApplicationContext();



        initialize();
    }

here is my xml layout:

<?xml version="1.0" encoding="utf-8"?>

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="fill_parent"
    android:layout_height="wrap_content" android:id="@+id/mainLayout" android:background="@layout/border">

    <TextView android:text="12am" android:id="@+id/hourTextView"
        android:layout_width="wrap_content" android:layout_height="wrap_content"></TextView>
</RelativeLayout>

i basicllay want to get the height of the above xml layout but it always returns 0.

edit: i have also tried doing this below:

@Override
    protected void onStart() {
        // TODO Auto-generated method stub
        super.onStart();

         final View hourView = View.inflate(mContext, R.layout.calendar_hour_item,null);
        ViewTreeObserver observer = hourView.getViewTreeObserver();

        observer.addOnGlobalLayoutListener(new OnGlobalLayoutListener() {

            @Override
            public void onGlobalLayout() {
                hourView.getViewTreeObserver().removeGlobalOnLayoutListener(this);
                hourViewHeight = hourView.getHeight();
                Log.d(TAG, "hourViewHeight = " + hourViewHeight);
            }
        });

//      hourViewHeight = hourView.findViewById(R.id.mainLayout).getHeight();
//      Log.d(TAG, "hourViewHeight = " + hourViewHeight);
    }

Answer 1

try

hourView.measure(hourView.getWidth(), hourView.getHeight());
hourView.getMeasuredHeight()

Answer 2

In the first example it didn't worked because when you are querying them, the view still haven't performed the layout and measure steps. You only told the view how it would "behave" in the layout, but it still didn't calculated where to put each view.

(Similar question: How to get the width and height of an android.widget.ImageView?)

In the second example you posted, I don't think you added the view to the activity so the activity won't draw it hence, you will never read that log message. call setContentView or addView to some layout.