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activity_main.xml
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<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical"
>
<EditText
android:id="@+id/txtCalc"
android:layout_width="fill_parent"
android:layout_height="116dp"
android:gravity="right"
android:inputType="none"
android:singleLine="true"
android:text="0"
android:textSize="56sp"
android:textStyle="normal"
android:typeface="normal" />
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_weight="1"
android:orientation="horizontal">
<Button
android:id="@+id/btnC"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_weight="1"
android:gravity="center"
android:padding="0px"
android:text="AC"
android:textSize="24sp"
android:textStyle="bold"
android:typeface="serif" />
<Button
android:id="@+id/btnC"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_weight="1"
android:gravity="center"
android:padding="0px"
android:text="DEL"
android:textSize="24sp"
android:textStyle="bold"
android:typeface="serif" />
</LinearLayout>
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_weight="1"
android:orientation="horizontal">
<Button
android:id="@+id/btnSeven"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_weight="1"
android:gravity="center"
android:padding="0px"
android:text="7"
android:textSize="24sp"
android:textStyle="bold"
android:typeface="serif" />
<Button
android:id="@+id/btnEight"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_weight="1"
android:gravity="center"
android:padding="0px"
android:text="8"
android:textSize="24sp"
android:textStyle="bold"
android:typeface="serif" />
<Button
android:id="@+id/btnNine"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_weight="1"
android:gravity="center"
android:padding="0px"
android:text="9"
android:textSize="24sp"
android:textStyle="bold"
android:typeface="serif" />
<Button
android:id="@+id/btnDivide"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_weight="1"
android:gravity="center"
android:padding="0px"
android:text="÷"
android:textSize="24sp"
android:textStyle="bold"
android:typeface="serif" />
</LinearLayout>
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_weight="1"
android:orientation="horizontal" >
<Button
android:id="@+id/btnFour"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_weight="1"
android:gravity="center"
android:padding="0px"
android:text="4"
android:textSize="24sp"
android:textStyle="bold"
android:typeface="serif" />
<Button
android:id="@+id/btnFive"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_weight="1"
android:gravity="center"
android:padding="0px"
android:text="5"
android:textSize="24sp"
android:textStyle="bold"
android:typeface="serif" />
<Button
android:id="@+id/btnSix"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_weight="1"
android:gravity="center"
android:padding="0px"
android:text="6"
android:textSize="24sp"
android:textStyle="bold"
android:typeface="serif" />
<Button
android:id="@+id/btnMultiply"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_weight="1"
android:gravity="center"
android:padding="0px"
android:text="*"
android:textSize="24sp"
android:textStyle="bold"
android:typeface="serif" />
</LinearLayout>
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_weight="1"
android:orientation="horizontal" >
<Button
android:id="@+id/btnOne"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_weight="1"
android:gravity="center"
android:padding="0px"
android:text="1"
android:textSize="24sp"
android:textStyle="bold"
android:typeface="serif" />
<Button
android:id="@+id/btnTwo"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_weight="1"
android:gravity="center"
android:padding="0px"
android:text="2"
android:textSize="24sp"
android:textStyle="bold"
android:typeface="serif" />
<Button
android:id="@+id/btnThree"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_weight="1"
android:gravity="center"
android:padding="0px"
android:text="3"
android:textSize="24sp"
android:textStyle="bold"
android:typeface="serif" />
<Button
android:id="@+id/btnMinus"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_weight="1"
android:gravity="center"
android:padding="0px"
android:text="-"
android:textSize="24sp"
android:textStyle="bold"
android:typeface="serif" />
</LinearLayout>
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_weight="1"
android:orientation="horizontal" >
<Button
android:id="@+id/btnZero"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_span="2"
android:layout_weight="1"
android:gravity="center"
android:padding="0px"
android:text="0"
android:textSize="23sp"
android:textStyle="bold"
android:typeface="serif" />
<Button
android:id="@+id/btnDecimal"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_weight="1"
android:gravity="center"
android:padding="0px"
android:text="."
android:textSize="23sp"
android:textStyle="bold"
android:typeface="serif" />
<Button
android:id="@+id/btnPlus"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_weight="1"
android:gravity="center"
android:padding="0px"
android:text="+"
android:textSize="23sp"
android:textStyle="bold"
android:typeface="serif" />
<Button
android:id="@+id/btnEquals"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_weight="1"
android:gravity="center"
android:padding="0px"
android:text="="
android:textSize="23sp"
android:textStyle="bold"
android:typeface="serif" />
</LinearLayout>
</LinearLayout>