Question

I have a TextView that i inflate in my activity. When i set text to this TextView its content is spread in multiple lines as this is the default behaviour.
e.g

    public void onCreate(Bundle savedInstanceState) {
       super.onCreate(savedInstanceState);

       setContentView(R.layout.location_details);

       // inflate the view
       descriptionTextView = (TextView)findViewById(R.id.descriptionTextView );
       descriptionTextView.setText("This is a long text that should be multilined");
       ....
    }

when i use the same text inside a Runnable in a runOnUiThread the text goes single line by default. I have to call setSingleLine(false) to be multilined …
e.g

    public void onCreate(Bundle savedInstanceState) {
       super.onCreate(savedInstanceState);

       setContentView(R.layout.location_details);

       // inflate the view
       descriptionTextView = (TextView)findViewById(R.id.descriptionTextView );

       new Thread(new Runnable(){
          public void run() {
             ...
             runOnUiThread(new Runnable(){
            @Override
            public void run() {
               descriptionTextView.setText("This is a long text that should be multilined");
            }
             });
          });
    }

Why is this happening ?

EDIT
My layout file is like this:

<?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" 
android:padding="6dp"
android:gravity="center|top"
android:background="@drawable/background">

<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="0dip"
    android:layout_weight="1"
    android:background="@drawable/bg_dashboard"
    android:gravity="center|top"
    android:orientation="vertical"
    android:padding="10dp" >

    <ScrollView
        android:id="@+id/scrollView1"
        android:layout_width="fill_parent"
        android:layout_height="0dip" 
        android:layout_gravity="center"
        android:layout_weight="1">

        <LinearLayout
            xmlns:android="http://schemas.android.com/apk/res/android"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:background="#ffffff"
            android:gravity="top"
            android:orientation="vertical" >

            <TextView
                android:id="@+id/titleTextView"
                android:layout_width="fill_parent"
                android:layout_height="wrap_content"
                android:layout_gravity="center"
                android:textStyle="bold"
                android:textColor="#565A5D"
                android:paddingTop="4dp"
                android:paddingBottom="4dp"
                android:paddingLeft="15dp"
                android:paddingRight="15dp"
                android:textSize="24sp" />

            <ImageView
                xmlns:android="http://schemas.android.com/apk/res/android"
                android:src="@drawable/divider"
                android:contentDescription="@string/metaDivider"
                android:layout_width="fill_parent"
                android:layout_height="wrap_content"
                android:scaleType="fitXY"
                android:paddingBottom="4dp"
                android:paddingTop="4dp" />

            <ImageView
                android:id="@+id/photoImageView"
                android:layout_width="fill_parent"
                android:adjustViewBounds="true"
                android:layout_height="160dp"
                android:padding="5dp"
                android:src="@null"
                android:contentDescription="@string/metaArticleImage" />

            <ImageView
                xmlns:android="http://schemas.android.com/apk/res/android"
                android:id="@+id/imageDivider"
                android:src="@drawable/divider"
                android:contentDescription="@string/metaDivider"
                android:layout_width="fill_parent"
                android:layout_height="wrap_content"
                android:scaleType="fitXY"
                android:paddingBottom="4dp"
                android:paddingTop="4dp" />

            <TextView
                android:id="@+id/descriptionTextView"
                android:layout_width="fill_parent"
                android:layout_height="0dp"
                android:layout_gravity="center"
                android:textColor="#55595C" 
                android:layout_weight="1"
                android:paddingTop="5dp" 
                android:paddingBottom="5dp"
                android:paddingLeft="15dp"
                android:paddingRight="15dp"/>

            <Button
                android:id="@+id/mapButton"
                android:layout_width="fill_parent"
                android:layout_height="wrap_content"
                android:text="@string/mapBtn" 
                android:layout_marginTop="5dp"
                android:layout_marginBottom="5dp"
                android:layout_marginLeft="15dp"
                android:layout_marginRight="15dp"
                android:layout_gravity="center" />

       </LinearLayout>     

    </ScrollView>

</LinearLayout> 

<ImageView
    android:contentDescription="@string/metaLogo"
    android:layout_gravity="right"
    android:layout_marginRight="15dp"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:src="@drawable/logo" />

Answer 1

Most likely it has to do with your layout constraints. The reason you are seeing a difference is because in one case (called directly from onCreate()) the text is set before the views are laid out, so the TextView height is set to match the content inside. In the second case (from the Thread), the text is set after layout is complete, and TextView does not adjust its size to match new content unless its LayoutParams explicitly tell it to do so.

If you set the layout_height attribute of your descriptionTextView to wrap_content, the resizing problem will go away.

HTH