app/src/main/res/layout/fragment_main.xml
<?xml version="1.0" encoding="utf-8"?><!--
~ Copyright (C) 2020 Satoki Mizoguchi
~
~ Licensed under the Apache License, Version 2.0 (the "License");
~ you may not use this file except in compliance with the License.
~ You may obtain a copy of the License at
~
~ http://www.apache.org/licenses/LICENSE-2.0
~
~ Unless required by applicable law or agreed to in writing, software
~ distributed under the License is distributed on an "AS IS" BASIS,
~ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
~ See the License for the specific language governing permissions and
~ limitations under the License.
-->
<GridLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:columnCount="3"
tools:context=".MainActivity">
<Button
android:id="@+id/button_1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_row="0"
android:layout_column="0"
android:layout_columnWeight="1"
android:layout_gravity="center_horizontal"
android:text="@string/button_1" />
<Button
android:id="@+id/button_2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_row="0"
android:layout_column="1"
android:layout_columnWeight="1"
android:layout_gravity="center_horizontal"
android:text="@string/button_2" />
<Button
android:id="@+id/button_3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_row="0"
android:layout_column="2"
android:layout_columnWeight="1"
android:layout_gravity="center_horizontal"
android:text="@string/button_3" />
<Button
android:id="@+id/button_4"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_row="1"
android:layout_column="0"
android:layout_columnWeight="1"
android:layout_gravity="center_horizontal"
android:text="@string/button_4" />
<Button
android:id="@+id/button_5"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_row="1"
android:layout_column="1"
android:layout_columnWeight="1"
android:layout_gravity="center_horizontal"
android:text="@string/button_5" />
<Button
android:id="@+id/button_6"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_row="1"
android:layout_column="2"
android:layout_columnWeight="1"
android:layout_gravity="center_horizontal"
android:text="@string/button_6" />
<Button
android:id="@+id/button_7"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_row="2"
android:layout_column="0"
android:layout_columnWeight="1"
android:layout_gravity="center_horizontal"
android:text="@string/button_7" />
<Button
android:id="@+id/button_8"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_row="2"
android:layout_column="1"
android:layout_columnWeight="1"
android:layout_gravity="center_horizontal"
android:text="@string/button_8" />
<Button
android:id="@+id/button_9"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_row="2"
android:layout_column="2"
android:layout_columnWeight="1"
android:layout_gravity="center_horizontal"
android:text="@string/button_9" />
<Button
android:id="@+id/button_10"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_row="3"
android:layout_column="0"
android:layout_columnWeight="1"
android:layout_gravity="center_horizontal"
android:text="@string/button_10" />
<Button
android:id="@+id/button_11"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_row="3"
android:layout_column="1"
android:layout_columnWeight="1"
android:layout_gravity="center_horizontal"
android:text="@string/button_11" />
<Button
android:id="@+id/button_12"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_row="3"
android:layout_column="2"
android:layout_columnWeight="1"
android:layout_gravity="center_horizontal"
android:text="@string/button_12" />
<Button
android:id="@+id/button_ch_up"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_row="4"
android:layout_column="0"
android:layout_columnWeight="1"
android:layout_gravity="center_horizontal"
android:text="@string/button_ch_up" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_row="5"
android:layout_column="0"
android:layout_columnWeight="1"
android:layout_gravity="center_horizontal"
android:text="@string/text_ch" />
<Button
android:id="@+id/button_ch_down"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_row="6"
android:layout_column="0"
android:layout_columnWeight="1"
android:layout_gravity="center_horizontal"
android:text="@string/button_ch_down" />
<Button
android:id="@+id/button_vol_up"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_row="4"
android:layout_column="2"
android:layout_columnWeight="2"
android:layout_gravity="center_horizontal"
android:text="@string/button_vol_up" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_row="5"
android:layout_column="2"
android:layout_columnWeight="1"
android:layout_gravity="center_horizontal"
android:text="@string/text_vol" />
<Button
android:id="@+id/button_vol_down"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_row="6"
android:layout_column="2"
android:layout_columnWeight="1"
android:layout_gravity="center_horizontal"
android:text="@string/button_vol_down" />
</GridLayout>