Android 计算器制作 1.布局

1.activity_main.xml文件布局

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<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:paddingLeft="@dimen/activity_horizontal_margin"     android:paddingRight="@dimen/activity_horizontal_margin"     android:paddingTop="@dimen/activity_vertical_margin"     android:orientation="vertical"     android:paddingBottom="@dimen/activity_vertical_margin" tools:context=".MainActivity">   <EditText     android:layout_width="fill_parent"     android:layout_height="90dp"     android:gravity="right|center_vertical"     android:id="@+id/edit_text1"     android:background="@drawable/white_bg"/>         <LinearLayout         android:layout_marginTop="10dp"         android:orientation="vertical"         android:layout_width="fill_parent"         android:layout_height="fill_parent">         <LinearLayout             android:layout_weight="1"             android:layout_width="fill_parent"             android:layout_height="0dp"             android:id="@+id/ll1"             android:orientation="horizontal"             >             <Button                 android:layout_weight="1"                 android:layout_width="0dp"                 android:layout_height="fill_parent"                 android:text="C"                 android:textSize="30sp"                 android:id="@+id/bt_clear"                 />             <Button                 android:layout_weight="1"                 android:layout_width="0dp"                 android:layout_height="fill_parent"                 android:text="DEL"                 android:textSize="30sp"                 android:id="@+id/bt_del"                 />             <Button                 android:layout_weight="1"                 android:layout_width="0dp"                 android:layout_height="fill_parent"                 android:text="÷"                 android:textSize="30sp"                 android:id="@+id/bt_divide"                 />             <Button                 android:layout_weight="1"                 android:layout_width="0dp"                 android:layout_height="fill_parent"                 android:text="×"                 android:textSize="30sp"                 android:id="@+id/bt_multipy"                 />           </LinearLayout>           <LinearLayout             android:layout_weight="1"             android:layout_width="fill_parent"             android:layout_height="0dp"             android:id="@+id/ll2"             android:orientation="horizontal"             >             <Button                 android:layout_weight="1"                 android:layout_width="0dp"                 android:layout_height="fill_parent"                 android:text="7"                 android:textSize="30sp"                 android:id="@+id/bt_7"                 />             <Button                 android:layout_weight="1"                 android:layout_width="0dp"                 android:layout_height="fill_parent"                 android:text="8"                 android:textSize="30sp"                 android:id="@+id/bt_8"                 />             <Button                 android:layout_weight="1"                 android:layout_width="0dp"                 android:layout_height="fill_parent"                 android:text="9"                 android:textSize="30sp"                 android:id="@+id/bt_9"                 />             <Button                 android:layout_weight="1"                 android:layout_width="0dp"                 android:layout_height="fill_parent"                 android:text="-"                 android:textSize="30sp"                 android:id="@+id/bt_minuse"                 />           </LinearLayout>           <LinearLayout             android:layout_weight="1"             android:layout_width="fill_parent"             android:layout_height="0dp"             android:id="@+id/ll3"             android:layout_below="@id/ll2"             android:orientation="horizontal"             >             <Button                 android:layout_weight="1"                 android:layout_width="0dp"                 android:layout_height="fill_parent"                 android:text="4"                 android:textSize="30sp"                 android:id="@+id/bt_4"                 />             <Button                 android:layout_weight="1"                 android:layout_width="0dp"                 android:layout_height="fill_parent"                 android:text="5"                 android:textSize="30sp"                 android:id="@+id/bt_5"                 />             <Button                 android:layout_weight="1"                 android:layout_width="0dp"                 android:layout_height="fill_parent"                 android:text="6"                 android:textSize="30sp"                 android:id="@+id/bt_6"                 />             <Button                 android:layout_weight="1"                 android:layout_width="0dp"                 android:layout_height="fill_parent"                 android:text="+"                 android:textSize="30sp"                 android:id="@+id/bt_plus"                 />           </LinearLayout>           <LinearLayout             android:layout_weight="2"             android:layout_width="fill_parent"             android:layout_height="0dp">             <LinearLayout                 android:orientation="vertical"                 android:layout_weight="3"                 android:layout_width="0dp"                 android:layout_height="fill_parent">               <LinearLayout                 android:layout_weight="1"                 android:layout_width="fill_parent"                 android:layout_height="0dp">                 <Button                     android:layout_weight="1"                     android:id="@+id/btn_1"                     android:text="1"                     android:textSize="30sp"                     android:layout_width="0dp"                     android:layout_height="fill_parent" />                 <Button                     android:layout_weight="1"                     android:id="@+id/btn_2"                     android:text="2"                     android:textSize="30sp"                     android:layout_width="0dp"                     android:layout_height="fill_parent" />                 <Button                     android:layout_weight="1"                     android:id="@+id/btn_3"                     android:text="3"                     android:textSize="30sp"                     android:layout_width="0dp"                     android:layout_height="fill_parent" />             </LinearLayout>               <LinearLayout                 android:layout_weight="1"                 android:layout_width="fill_parent"                 android:layout_height="0dp">                 <Button                     android:layout_weight="2"                     android:id="@+id/btn_0"                     android:text="0"                     android:textSize="30sp"                     android:layout_width="0dp"                     android:layout_height="fill_parent" />                 <Button                     android:layout_weight="1"                     android:id="@+id/btn_point"                     android:text="."                     android:textSize="30sp"                     android:layout_width="0dp"                     android:layout_height="fill_parent" />             </LinearLayout>                   </LinearLayout>               <LinearLayout                 android:layout_weight="1"                 android:layout_width="0dp"                 android:layout_height="fill_parent">                 <Button                     android:layout_width="fill_parent"                     android:layout_height="fill_parent"                     android:text="="                     android:id="@+id/btn_dengyu"                     android:textSize="30sp"                     />                 </LinearLayout>         </LinearLayout>       </LinearLayout>     </LinearLayout>

　　

2.mainfest.xml设置

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1 2	<activity     android:theme="@android:style/Theme.Black.NoTitleBar"/> //主题 黑色 没有标题

3.color.xml的写法

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<?xml version="1.0" encoding="utf-8"?> <resources>     <color name="white">#ffffff</color>     <color name="black">#000000</color> </resources>

4.drawable 下创建 white_bg.xml作为EditText白色背景

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<?xml version="1.0" encoding="utf-8"?> <shape xmlns:android="http://schemas.android.com/apk/res/android">       <corners android:radius="5dp"/>　　　　//角 半径5dp 圆角     <solid　　　　　　　　　　　　　　　　　　//填充色         android:color="@color/white"         />　　 </shape>

　　

①<corners/>:设置圆角。android:radius="5dp"：圆角半径为5dp。
②<gradient/>：图像颜色的渐变。开始颜色：startColor="@color/white"。结束颜色：endColor="@color/red"
③<stroke/>：边框。width="1dp"：边框宽度。color="@color/black"：边框颜色。
④<solid/>：填充色。color="@color/white"：填充色为白色。