布局文件

<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.LinearLayoutCompat xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <android.support.v7.widget.AppCompatTextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:padding="50dp"
        android:text="@string/happy"
        android:textColor="@android:color/holo_red_dark"
        android:textSize="30sp" />

</android.support.v7.widget.LinearLayoutCompat>

字符串资源文件有两个

strings.xml

<resources>
    <string name="app_name" translatable="false">LatteNew</string>
    <string name="happy">hhh</string>
</resources>

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <string name="app_name" translatable="false">LatteNew</string>
    <string name="happy">哈哈哈</string>
</resources>