
<GridLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="match_parent" android:layout_height="match_parent" android:columnCount="4" android:rowCount="6"> <EditText android:layout_gravity="fill" android:layout_columnWeight="1" android:layout_rowWeight="20" android:layout_columnSpan="4" android:hint="0" android:gravity="bottom|right"/> <Button android:layout_gravity="fill" android:layout_columnWeight="1" android:text="C" android:layout_rowWeight="1"/> <Button android:layout_gravity="fill" android:layout_columnWeight="1" android:text="7" android:layout_rowWeight="1"/> <Button android:layout_gravity="fill" android:layout_columnWeight="1" android:text="4" android:layout_rowWeight="1"/> <Button android:layout_gravity="fill" android:layout_columnWeight="1" android:text="1" android:layout_rowWeight="1"/> <Button android:layout_gravity="fill" android:layout_columnWeight="1" android:layout_rowWeight="1" android:text="=" android:layout_columnSpan="2"/> <Button android:layout_gravity="fill" android:layout_columnWeight="1" android:layout_rowWeight="1" android:text="Del"/> <Button android:layout_gravity="fill" android:layout_columnWeight="1" android:layout_rowWeight="1" android:text="8"/> <Button android:layout_gravity="fill" android:layout_columnWeight="1" android:layout_rowWeight="1" android:text="5"/> <Button android:layout_gravity="fill" android:layout_columnWeight="1" android:layout_rowWeight="1" android:text="2"/> <Button android:layout_gravity="fill" android:layout_columnWeight="1" android:layout_rowWeight="1" android:text="÷"/> <Button android:layout_gravity="fill" android:layout_columnWeight="1" android:layout_rowWeight="1" android:text="9"/> <Button android:layout_gravity="fill" android:layout_columnWeight="1" android:layout_rowWeight="1" android:text="6"/> <Button android:layout_gravity="fill" android:layout_columnWeight="1" android:layout_rowWeight="1" android:text="3"/> <Button android:layout_gravity="fill" android:layout_columnWeight="1" android:layout_rowWeight="1" android:text="."/> <Button android:layout_gravity="fill" android:layout_columnWeight="1" android:layout_rowWeight="1" android:text="X"/> <Button android:layout_gravity="fill" android:layout_columnWeight="1" android:layout_rowWeight="1" android:text="-"/> <Button android:layout_gravity="fill" android:layout_columnWeight="1" android:layout_rowWeight="1" android:text="+"/> <Button android:layout_gravity="fill" android:layout_columnWeight="1" android:layout_rowWeight="1" android:layout_rowSpan="2" android:text="=" android:background="#F00"/> </GridLayout>