text: <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
      android:layout_width="match_parent"
      android:layout_height="match_parent"
      android:orientation="vertical"
      android:padding="5dp" >
  
      <TextView
          android:layout_width="match_parent"
          android:layout_height="wrap_content"
          android:text="点击验证码即可刷新验证码图片"
          android:textColor="@color/black"
          android:textSize="17sp" />
  
      <ImageView
          android:id="@+id/iv_image_code"
          android:layout_width="match_parent"
          android:layout_height="100dp"
          android:scaleType="fitCenter" />
      
  </LinearLayout>