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界面代码：

xmlns:android="http://schemas.android.com/apk/res/android"

android:layout_width="match_parent"

android:layout_height="match_parent"

android:background="#b0e0e6"

xmlns:app="http://schemas.android.com/apk/res-auto"

xmlns:corners="http://schemas.android.com/tools">

android:layout_width="match_parent"

android:layout_height="match_parent">

android:id="@+id/list_view_left"

app:layout_widthPercent="25%"

android:layout_height="210dp"

app:layout_marginBottomPercent="18%"

app:layout_marginRightPercent="10%"

android:scrollbars="none"

android:background="@drawable/shape_listview_left"/>

android:id="@+id/list_view_right"

app:layout_widthPercent="55%"

android:layout_height="210dp"

app:layout_marginTopPercent="18%"

app:layout_marginLeftPercent="35%"

android:scrollbars="none"

android:textAlignment="gravity"

android:background="@drawable/shape_listview_right"/>

android:id="@+id/btn_up"

app:layout_widthPercent="20%"

app:layout_heightPercent="13%"

app:layout_marginTopPercent="68%"

app:layout_marginLeftPercent="11%"

android:background="@drawable/shape"

android:textSize="35dp"

android:gravity="center"

android:text="+" />

android:id="@+id/btn_down"

app:layout_widthPercent="20%"

app:layout_heightPercent="13%"

app:layout_marginTopPercent="68%"

app:layout_marginLeftPercent="69%"

android:background="@drawable/shape"

android:textSize="35dp"

android:gravity="center"

android:text="-"/>

android:id="@+id/btn_on"

app:layout_widthPercent="20%"

app:layout_heightPercent="13%"

app:layout_marginTopPercent="68%"

android:text="on"

android:gravity="center"

android:background="@drawable/shape"

android:textSize="25dp"

android:layout_centerHorizontal="true" />