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

    <string name="app_name">Helloa</string>
    <string name="hello_world">Hello world!</string>
    <string name="action_settings">Settings</string>
    <string name="button_name">登录</string>
</resources>

    <Button
        android:id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@+id/imageView1"
        android:layout_below="@+id/imageView1"
        android:layout_marginLeft="17dp"
        android:layout_marginTop="36dp"
        android:text="@string/button_name"
        />

不生效