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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" />