计算器布局

<LinearLayout
android:layout_marginTop="30dp"
android:layout_marginLeft="30dp"
android:layout_marginRight="30dp"
android:layout_width="match_parent"
android:layout_height="40dp"
android:orientation="horizontal" >

    <Button
        android:id="@+id/num_one"
        android:background="@drawable/bg_btn"
        android:layout_marginLeft="5dp"
        android:layout_marginRight="5dp"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_weight="1"
        android:textSize="@dimen/dimen_forty_four"
        android:text="1" />

    <Button
        android:id="@+id/num_two"
        android:textSize="@dimen/dimen_forty_four"
        android:background="@drawable/bg_btn"
        android:layout_marginLeft="5dp"
        android:layout_marginRight="5dp"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_weight="1"
        android:text="2" />

    <Button
        android:id="@+id/num_three"
        android:textSize="@dimen/dimen_forty_four"
        android:background="@drawable/bg_btn"
        android:layout_marginLeft="5dp"
        android:layout_marginRight="5dp"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_weight="1"
        android:text="3" />

    <Button
        android:textSize="@dimen/dimen_forty_four"
        android:id="@+id/num_del"
        android:background="@drawable/bg_btn"
        android:layout_marginLeft="5dp"
        android:layout_marginRight="5dp"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_weight="1"
        android:text="删除" />
</LinearLayout>
<LinearLayout
    android:layout_marginLeft="30dp"
    android:layout_marginRight="30dp"
    android:layout_width="match_parent"
    android:layout_height="150dp"
    android:orientation="horizontal" >

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_weight="1"
        android:orientation="vertical" >

        <LinearLayout
            android:layout_marginTop="10dp"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_weight="1"
            android:orientation="horizontal" >

            <Button
                android:id="@+id/num_four"
                android:textSize="@dimen/dimen_forty_four"
                android:background="@drawable/bg_btn"
                android:layout_marginLeft="5dp"
                android:layout_marginRight="5dp"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:layout_weight="1"
                android:text="4" />
            <Button
                android:id="@+id/num_five"
                android:textSize="@dimen/dimen_forty_four"
                android:background="@drawable/bg_btn"
                android:layout_marginLeft="5dp"
                android:layout_marginRight="5dp"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:layout_weight="1"
                android:text="5" />

            <Button
                android:id="@+id/num_six"
                android:textSize="@dimen/dimen_forty_four"
                android:background="@drawable/bg_btn"
                android:layout_marginLeft="5dp"
                android:layout_marginRight="5dp"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:layout_weight="1"
                android:text="6" />
        </LinearLayout>

        <LinearLayout

            android:layout_marginTop="10dp"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_weight="1"
            android:orientation="horizontal" >

            <Button
                android:textSize="@dimen/dimen_forty_four"
                android:id="@+id/num_seven"
                android:background="@drawable/bg_btn"
                android:layout_marginLeft="5dp"
                android:layout_marginRight="5dp"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:layout_weight="1"
                android:text="7" />
            <Button
                android:id="@+id/num_eight"
                android:textSize="@dimen/dimen_forty_four"
                android:background="@drawable/bg_btn"
                android:layout_marginLeft="5dp"
                android:layout_marginRight="5dp"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:layout_weight="1"
                android:text="8" />

            <Button
                android:id="@+id/num_nine"
                android:textSize="@dimen/dimen_forty_four"
                android:background="@drawable/bg_btn"
                android:layout_marginLeft="5dp"
                android:layout_marginRight="5dp"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:layout_weight="1"
                android:text="9" />
        </LinearLayout>
        <LinearLayout
            android:layout_marginTop="10dp"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_weight="1"
            android:orientation="horizontal" >

            <Button
                android:id="@+id/num_zero"
                android:textSize="@dimen/dimen_forty_four"
                android:background="@drawable/bg_btn"
                android:layout_marginLeft="5dp"
                android:layout_marginRight="5dp"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:layout_weight="1"
                android:text="0" />
            <Button
                android:id="@+id/num_dian"
                android:textSize="@dimen/dimen_forty_four"
                android:background="@drawable/bg_btn"
                android:layout_marginLeft="5dp"
                android:layout_marginRight="5dp"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:layout_weight="1"
                android:text="." />

            <Button
                android:id="@+id/num_zerozero"
                android:textSize="@dimen/dimen_forty_four"
                android:background="@drawable/bg_btn"
                android:layout_marginLeft="5dp"
                android:layout_marginRight="5dp"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:layout_weight="1"
                android:text="00" />
        </LinearLayout>
    </LinearLayout>

    <Button
        android:id="@+id/num_confirm"
        android:textSize="@dimen/dimen_forty_four"
        android:layout_marginTop="10dp"
        android:background="@drawable/bg_btn"
        android:layout_marginLeft="5dp"
        android:layout_marginRight="5dp"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_weight="3"
        android:text="确定" />
</LinearLayout>