1.案例-计算器-界面编码
1.1activity_calculator.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#EEEEEE"
android:orientation="vertical"
android:padding="5dp">
<ScrollView
android:layout_width="match_parent"
android:layout_height="wrap_content">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="@string/simple_calculator"
android:gravity="center"
android:textColor="@color/black"
android:textSize="20sp" />
<TextView
android:id="@+id/tv_result"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="@color/white"
android:gravity="right|bottom"
android:lines="3"
android:text="0"
android:textColor="@color/black"
android:textSize="25sp"/>
<GridLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:columnCount="4"
android:rowCount="5">
<Button
android:id="@+id/btn_cancel"
android:layout_width="0dp"
android:layout_height="@dimen/button_height"
android:layout_columnWeight="1"
android:gravity="center"
android:text="@string/cancel"
android:textColor="@color/black"
android:textSize="@dimen/button_font_size"/>
<Button
android:id="@+id/btn_divide"
android:layout_width="0dp"
android:layout_height="@dimen/button_height"
android:layout_columnWeight="1"
android:gravity="center"
android:text="@string/divide"
android:textColor="@color/black"
android:textSize="@dimen/button_font_size"/>
<Button
android:id="@+id/btn_multiply"
android:layout_width="0dp"
android:layout_height="@dimen/button_height"
android:layout_columnWeight="1"
android:gravity="center"
android:text="@string/multiply"
android:textColor="@color/black"
android:textSize="@dimen/button_font_size"/>
<Button
android:id="@+id/btn_clear"
android:layout_width="0dp"
android:layout_height="@dimen/button_height"
android:layout_columnWeight="1"
android:gravity="center"
android:text="@string/clear"
android:textColor="@color/black"
android:textSize="@dimen/button_font_size"/>
<Button
android:id="@+id/btn_seven"
android:layout_width="0dp"
android:layout_height="@dimen/button_height"
android:layout_columnWeight="1"
android:gravity="center"
android:text="@string/seven"
android:textColor="@color/black"
android:textSize="@dimen/button_font_size"/>
<Button
android:id="@+id/btn_eight"
android:layout_width="0dp"
android:layout_height="@dimen/button_height"
android:layout_columnWeight="1"
android:gravity="center"
android:text="@string/eight"
android:textColor="@color/black"
android:textSize="@dimen/button_font_size"/>
<Button
android:id="@+id/btn_nine"
android:layout_width="0dp"
android:layout_height="@dimen/button_height"
android:layout_columnWeight="1"
android:gravity="center"
android:text="@string/nine"
android:textColor="@color/black"
android:textSize="@dimen/button_font_size"/>
<Button
android:id="@+id/btn_plus"
android:layout_width="0dp"
android:layout_height="@dimen/button_height"
android:layout_columnWeight="1"
android:gravity="center"
android:text="@string/plus"
android:textColor="@color/black"
android:textSize="@dimen/button_font_size"/>
<Button
android:id="@+id/btn_four"
android:layout_width="0dp"
android:layout_height="@dimen/button_height"
android:layout_columnWeight="1"
android:gravity="center"
android:text="@string/four"
android:textColor="@color/black"
android:textSize="@dimen/button_font_size"/>
<Button
android:id="@+id/btn_five"
android:layout_width="0dp"
android:layout_height="@dimen/button_height"
android:layout_columnWeight="1"
android:gravity="center"
android:text="@string/five"
android:textColor="@color/black"
android:textSize="@dimen/button_font_size"/>
<Button
android:id="@+id/btn_six"
android:layout_width="0dp"
android:layout_height="@dimen/button_height"
android:layout_columnWeight="1"
android:gravity="center"
android:text="@string/six"
android:textColor="@color/black"
android:textSize="@dimen/button_font_size"/>
<Button
android:id="@+id/btn_minus"
android:layout_width="0dp"
android:layout_height="@dimen/button_height"
android:layout_columnWeight="1"
android:gravity="center"
android:text="@string/minus"
android:textColor="@color/black"
android:textSize="@dimen/button_font_size"/>
<Button
android:id="@+id/btn_one"
android:layout_width="0dp"
android:layout_height="@dimen/button_height"
android:layout_columnWeight="1"
android:gravity="center"
android:text="@string/one"
android:textColor="@color/black"
android:textSize="@dimen/button_font_size"/>
<Button
android:id="@+id/btn_two"
android:layout_width="0dp"
android:layout_height="@dimen/button_height"
android:layout_columnWeight="1"
android:gravity="center"
android:text="@string/two"
android:textColor="@color/black"
android:textSize="@dimen/button_font_size"/>
<Button
android:id="@+id/btn_three"
android:layout_width="0dp"
android:layout_height="@dimen/button_height"
android:layout_columnWeight="1"
android:gravity="center"
android:text="@string/three"
android:textColor="@color/black"
android:textSize="@dimen/button_font_size"/>
<ImageButton
android:id="@+id/ib_sqrt"
android:layout_width="0dp"
android:layout_height="@dimen/button_height"
android:layout_columnWeight="1"
android:scaleType="centerInside"
android:src="@drawable/sqrt" />
<Button
android:id="@+id/btn_reciprocal"
android:layout_width="0dp"
android:layout_height="@dimen/button_height"
android:layout_columnWeight="1"
android:gravity="center"
android:text="@string/reciprocal"
android:textColor="@color/black"
android:textSize="@dimen/button_font_size"/>
<Button
android:id="@+id/btn_zero"
android:layout_width="0dp"
android:layout_height="@dimen/button_height"
android:layout_columnWeight="1"
android:gravity="center"
android:text="@string/zero"
android:textColor="@color/black"
android:textSize="@dimen/button_font_size"/>
<Button
android:id="@+id/btn_dot"
android:layout_width="0dp"
android:layout_height="@dimen/button_height"
android:layout_columnWeight="1"
android:gravity="center"
android:text="@string/dot"
android:textColor="@color/black"
android:textSize="@dimen/button_font_size"/>
<Button
android:id="@+id/btn_equal"
android:layout_width="0dp"
android:layout_height="@dimen/button_height"
android:layout_columnWeight="1"
android:gravity="center"
android:text="@string/equal"
android:textColor="@color/black"
android:textSize="@dimen/button_font_size"/>
</GridLayout>
</LinearLayout>
</ScrollView>
</LinearLayout>
1.2strings.xml
<resources>
<string name="app_name">chapter03</string>
<string name="hello">你好，世界</string>
<string name="simple_calculator">简易计算器</string>
<string name="cancel">CE</string>
<string name="divide">/</string>
<string name="multiply">*</string>
<string name="clear">C</string>
<string name="seven">7</string>
<string name="eight">8</string>
<string name="nine">9</string>
<string name="plus">+</string>
<string name="four">4</string>
<string name="five">5</string>
<string name="six">6</string>
<string name="minus">-</string>
<string name="one">1</string>
<string name="two">2</string>
<string name="three">3</string>
<string name="reciprocal">1/x</string>
<string name="zero">0</string>
<string name="dot">.</string>
<string name="equal">=</string>
</resources>
1.3dimens.xml
<?xml version="1.0" encoding="utf-8"?>
<resources>
<dimen name="button_font_size">30sp</dimen>
<dimen name="button_height">75dp</dimen>
</resources>
1.4效果（备注：后端逻辑代码没敲完，先把这一节的页面发出来）
标签：xml,10,14,没敲,2022,计算器 From： https://www.cnblogs.com/pingfanliliang/p/16790287.html