示例：

<TextView
            android:id="@+id/tvNewDevice"
            android:layout_width="0dp"
            android:layout_height="38dp"
            android:layout_weight = "1"
            android:layout_marginTop="0dp"
            android:text="添加設備"
            android:textAlignment="center"
 

            android:gravity="center"
            android:textColor="@color/color_text_gray"
            android:textSize="@dimen/title_text_size"
            android:background="@drawable/tv_bg_selector"
            android:clickable="true"
            />

android:textAlignment="center" -- 水平居中

android:gravity="center" --垂直居中

android:background="@drawable/tv_bg_selector" --選中狀態

android:clickable="true"

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android" >
    <item android:state_pressed="true">
        <shape android:shape
 
="rectangle">
            <solid android:color="#11000000"/>
        </shape>
    </item>
    <item android:state_pressed="false">
        <shape android:shape="rectangle">
            <!-- 透明色 -->
            <solid android:color="#00000000"/>
        </shape>
    </item>

</selector>

[Android] TextView 屬性說明