linear.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:weightSum="4"
tools:context="com.example.pc.myapplication.MainActivity">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_weight="1"
android:orientation="horizontal">
<Button
android:id="@+id/b1"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_weight="1"
android:text="1"
android:textSize="20dp"
android:background="@drawable/color"
android:textColor="#fff"/>
<Button
android:id="@+id/b2"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_weight="1"
android:text="2"
android:textSize="20dp"
android:background="@drawable/color"
android:textColor="#fff"/>
<Button
android:id="@+id/b3"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_weight="1"
android:text="3"
android:textSize="20dp"
android:background="@drawable/color"
android:textColor="#fff"/>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_weight="1"
android:orientation="horizontal"
android:textSize="20dp">
<Button
android:id="@+id/b4"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_weight="1"
android:text="4"
android:textSize="20dp"
android:background="@drawable/color"
android:textColor="#fff"/>
<Button
android:id="@+id/b5"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_weight="1"
android:text="5"
android:textSize="20dp"
android:background="@drawable/color"
android:textColor="#fff"/>
<Button
android:id="@+id/b6"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_weight="1"
android:text="6"
android:textSize="20dp"
android:background="@drawable/color"
android:textColor="#fff"/>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_weight="1"
android:orientation="horizontal">
<Button
android:id="@+id/b7"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_weight="1"
android:text="7"
android:textSize="20dp"
android:background="@drawable/color"
android:textColor="#fff"/>
<Button
android:id="@+id/b8"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_weight="1"
android:text="8"
android:textSize="20dp"
android:background="@drawable/color"
android:textColor="#fff"/>
<Button
android:id="@+id/b9"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_weight="1"
android:text="9"
android:textSize="20dp"
android:background="@drawable/color"
android:textColor="#fff"/>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_gravity="center"
android:layout_weight="1"
android:orientation="horizontal"
android:paddingLeft="130dp"
android:paddingRight="130dp">
<Button
android:id="@+id/b0"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:text="0"
android:textSize="20dp"
android:background="@drawable/color"
android:textColor="#fff"/>
</LinearLayout>
</LinearLayout>
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:weightSum="4"
tools:context="com.example.pc.myapplication.MainActivity">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_weight="1"
android:orientation="horizontal">
<Button
android:id="@+id/b1"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_weight="1"
android:text="1"
android:textSize="20dp"
android:background="@drawable/color"
android:textColor="#fff"/>
<Button
android:id="@+id/b2"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_weight="1"
android:text="2"
android:textSize="20dp"
android:background="@drawable/color"
android:textColor="#fff"/>
<Button
android:id="@+id/b3"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_weight="1"
android:text="3"
android:textSize="20dp"
android:background="@drawable/color"
android:textColor="#fff"/>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_weight="1"
android:orientation="horizontal"
android:textSize="20dp">
<Button
android:id="@+id/b4"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_weight="1"
android:text="4"
android:textSize="20dp"
android:background="@drawable/color"
android:textColor="#fff"/>
<Button
android:id="@+id/b5"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_weight="1"
android:text="5"
android:textSize="20dp"
android:background="@drawable/color"
android:textColor="#fff"/>
<Button
android:id="@+id/b6"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_weight="1"
android:text="6"
android:textSize="20dp"
android:background="@drawable/color"
android:textColor="#fff"/>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_weight="1"
android:orientation="horizontal">
<Button
android:id="@+id/b7"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_weight="1"
android:text="7"
android:textSize="20dp"
android:background="@drawable/color"
android:textColor="#fff"/>
<Button
android:id="@+id/b8"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_weight="1"
android:text="8"
android:textSize="20dp"
android:background="@drawable/color"
android:textColor="#fff"/>
<Button
android:id="@+id/b9"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_weight="1"
android:text="9"
android:textSize="20dp"
android:background="@drawable/color"
android:textColor="#fff"/>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_gravity="center"
android:layout_weight="1"
android:orientation="horizontal"
android:paddingLeft="130dp"
android:paddingRight="130dp">
<Button
android:id="@+id/b0"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:text="0"
android:textSize="20dp"
android:background="@drawable/color"
android:textColor="#fff"/>
</LinearLayout>
</LinearLayout>
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