<LinearLayout?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:paddingBottom="@dimen/activity_vertical_margin"
????android:paddingLeft="@dimen/activity_horizontal_margin"
????android:paddingRight="@dimen/activity_horizontal_margin"
????android:paddingTop="@dimen/activity_vertical_margin"
????tools:context=".MainActivity"?>
????<EditText?
????????android:id="@+id/et_input"
????????android:layout_width="match_parent"
????????android:layout_height="60dp"
android:editable="false"??????
android:background="@drawable/white_bg"
android:gravity="right|bottom"
????????/>
? <LinearLayout?
? ????android:layout_width="fill_parent"
???? android:layout_height="wrap_content"
???? android:layout_marginTop="20dp"
? ????android:orientation="horizontal"
???? android:gravity="center_horizontal"
? ????>
? ????<Button?
? ????????android:id="@+id/bt_clear"
? ????????android:layout_width="60dp"
? ????????android:layout_height="60dp"
? ????????android:text="C"
? ????????android:textSize="20sp"
? ????????android:gravity="right|bottom"
? ????????/>
? ?????<Button?
? ????????android:id="@+id/bt_del"
? ????????android:layout_width="60dp"
? ????????android:layout_height="60dp"
? ????????android:text="DEl"
? ????????android:layout_marginLeft="10dp"
? ????????android:textSize="20sp"
? ????????android:gravity="right|bottom"
? ????????/>
??<Button?
? ????????android:id="@+id/bt_divide"
? ????????android:layout_width="60dp"
? ????????android:layout_height="60dp"
? ????????android:text="÷"
? ????????android:layout_marginLeft="10dp"
? ????????android:textSize="20sp"
? ????????android:gravity="right|bottom"
? ????????/>
?<Button?
? ????????android:id="@+id/bt_multiply"
? ????????android:layout_width="60dp"
? ????????android:layout_height="60dp"
? ????????android:text="×"
? ????????android:layout_marginLeft="10dp"
? ????????android:textSize="20sp"
? ????????android:gravity="right|bottom"
? ????????/>
? ????
? </LinearLayout>
</LinearLayout>
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