Change Spinner DropDown width

Question

I need resize this part size to full display. How can i do this?

My adapter:

String[] navigations = getResources().getStringArray(R.array.actionBar);
        ArrayAdapter<String> adapter = new ArrayAdapter<String>(
                getBaseContext(), R.layout.custom_spinner_title_bar,
                android.R.id.text1, navigations);
        adapter.setDropDownViewResource(R.layout.custom_spinner_title_bar);
        actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_LIST);
        actionBar.setListNavigationCallbacks(adapter, navigationListener);

custom_spinner_title_bar.xml:

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/RelativeLayout1"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:gravity="fill_horizontal"
    android:orientation="vertical" >

    <TextView
        xmlns:android="http://schemas.android.com/apk/res/android"
        android:id="@android:id/text1"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:gravity="center"
        android:padding="5dip"
        android:textAppearance="?android:attr/textAppearanceMedium"
        android:textColor="#FFFFFF" />

</RelativeLayout>

Answer 1

Add Attribute in xml file in Spinner tag

android:dropDownWidth="150dp"