// JAVA
ActionBar actionBar = getSupportActionBar();
        if (actionBar != null) {
            actionBar.setDisplayOptions(ActionBar.DISPLAY_SHOW_CUSTOM);
            // Custom ActionBar
            View customView = LayoutInflater.from(this).inflate(
                    R.layout.actionbar_title, null);
            TextView tv = (TextView) customView.findViewById(R.id.custom_title);
            tv.setText("基本情報取込");
            // Set ActionBar properties
            ActionBar.LayoutParams params = new ActionBar.LayoutParams(
                    ActionBar.LayoutParams.MATCH_PARENT,
                    ActionBar.LayoutParams.MATCH_PARENT, Gravity.CENTER);
            actionBar.setCustomView(customView, params);
            actionBar.setDisplayHomeAsUpEnabled(true);
        }

//XML
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >

    <TextView
        android:id="@+id/custom_title"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:gravity="center"
        android:ellipsize="end"
        android:maxLines="1"
        android:textAppearance="?android:attr/textAppearanceMedium"
        android:textColor="@android:color/white" />

</RelativeLayout>