这篇文章主要介绍android studio如何实现计算器，文中介绍的非常详细，具有一定的参考价值，感兴趣的小伙伴们一定要看完！
Android是一种基于Linux内核的自由及开放源代码的操作系统，主要使用于移动设备，如智能手机和平板电脑，由美国Google公司和开放手机联盟领导及开发。
具体内容如下
效果图：
资源文件：
color.xml
<?xml version="1.0" encoding="utf-8"?> <resources> <color name="colorPrimary">#3F51B5</color> <color name="colorPrimaryDark">#303F9F</color> <color name="colorAccent">#FF4081</color> <color name="white">#FFFFFF</color> <color name="black">#000000</color> <color name="zi">#FFFFFF</color> <color name="gray">#BEBEBE</color> <color name="green">#9AFF9A</color> <color name="littlegreen">#F0FFFF</color> </resources>
white.xml
设置input text的填充色为白色
<?xml version="1.0" encoding="utf-8"?> <shape xmlns:android="http://schemas.android.com/apk/res/android"> <corners android:radius="5dp"/> <solid android:color="@color/white"/> </shape>
selector.xml
点击按钮时产生阴影效果
<?xml version="1.0" encoding="utf-8"?> <selector xmlns:android="http://schemas.android.com/apk/res/android"> <item android:drawable="@color/littlegreen" android:state_pressed="true"/> <item android:drawable="@color/white" /> </selector>
equeal.xml
同理，等号的阴影效果
<?xml version="1.0" encoding="utf-8"?> <selector xmlns:android="http://schemas.android.com/apk/res/android"> <item android:drawable="@color/white" android:state_pressed="true"/> <item android:drawable="@color/littlegreen" /> </selector>
布局文件
<?xml version="1.0" encoding="utf-8"?> <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:orientation="vertical" android:background="@drawable/jisuanqi" tools:context="com.example.administrator.calculate.MainActivity" > <LinearLayout android:layout_width="fill_parent" android:layout_height="wrap_content" android:layout_marginTop="30dp" android:paddingLeft="20dp" android:paddingRight="20dp" android:paddingTop="20dp"> <EditText android:id="@+id/input" android:layout_width="fill_parent" android:layout_height="60dp" android:background="@drawable/white" android:editable="false" android:gravity="right|bottom" /> </LinearLayout> <LinearLayout android:layout_width="fill_parent" android:layout_height="wrap_content" android:layout_marginTop="20dp" android:orientation="horizontal" android:gravity="center"> <Button android:layout_width="65dp" android:layout_height="65dp" android:text="C" android:background="@drawable/selector" android:gravity="center" android:textSize="25sp" android:id="@+id/clear" /> <Button android:layout_width="65dp" android:layout_height="65dp" android:text="←" android:background="@drawable/selector" android:gravity="center" android:layout_marginLeft="10dp" android:textSize="23sp" android:id="@+id/delete" /> <Button android:layout_width="65dp" android:layout_height="65dp" android:text="×" android:background="@drawable/selector" android:gravity="center" android:layout_marginLeft="10dp" android:textSize="25sp" android:id="@+id/cheng" /> <Button android:layout_width="65dp" android:layout_height="65dp" android:text="÷" android:background="@drawable/selector" android:gravity="center" android:layout_marginLeft="10dp" android:textSize="25sp" android:id="@+id/clu" /> </LinearLayout> <LinearLayout android:layout_width="fill_parent" android:layout_height="wrap_content" android:layout_marginTop="20dp" android:orientation="horizontal" android:gravity="center"> <Button android:layout_width="65dp" android:layout_height="65dp" android:text="7" android:background="@drawable/selector" android:gravity="center" android:textSize="25sp" android:id="@+id/num7" /> <Button android:layout_width="65dp" android:layout_height="65dp" android:text="8" android:background="@drawable/selector" android:gravity="center" android:layout_marginLeft="10dp" android:textSize="25sp" android:id="@+id/num8" /> <Button android:layout_width="65dp" android:layout_height="65dp" android:text="9" android:background="@drawable/selector" android:gravity="center" android:layout_marginLeft="10dp" android:textSize="25sp" android:id="@+id/num9" /> <Button android:layout_width="65dp" android:layout_height="65dp" android:text="－" android:background="@drawable/selector" android:gravity="center" android:layout_marginLeft="10dp" android:textSize="25sp" android:id="@+id/charjian" /> </LinearLayout> <LinearLayout android:layout_width="fill_parent" android:layout_height="wrap_content" android:layout_marginTop="20dp" android:orientation="horizontal" android:gravity="center"> <Button android:layout_width="65dp" android:layout_height="65dp" android:text="4" android:background="@drawable/selector" android:gravity="center" android:textSize="25sp" android:id="@+id/num4" /> <Button android:layout_width="65dp" android:layout_height="65dp" android:text="5" android:background="@drawable/selector" android:gravity="center" android:layout_marginLeft="10dp" android:textSize="25sp" android:id="@+id/num5" /> <Button android:layout_width="65dp" android:layout_height="65dp" android:text="6" android:background="@drawable/selector" android:gravity="center" android:layout_marginLeft="10dp" android:textSize="25sp" android:id="@+id/num6" /> <Button android:layout_width="65dp" android:layout_height="65dp" android:text="＋" android:background="@drawable/selector" android:gravity="center" android:layout_marginLeft="10dp" android:textSize="25sp" android:id="@+id/charadd" /> </LinearLayout> <LinearLayout android:layout_width="fill_parent" android:layout_height="wrap_content" android:orientation="horizontal" android:gravity="center_horizontal" android:layout_marginTop="10dp" > <LinearLayout android:layout_width="wrap_content" android:layout_height="wrap_content" android:orientation="vertical" > <LinearLayout android:layout_width="wrap_content" android:layout_height="wrap_content" android:orientation="horizontal" > <Button android:layout_width="65dp" android:layout_height="65dp" android:background="@drawable/selector" android:text="1" android:gravity="center" android:textSize="25sp" android:id="@+id/num1" /> <Button android:layout_width="65dp" android:layout_height="65dp" android:text="2" android:background="@drawable/selector" android:gravity="center" android:layout_marginLeft="10dp" android:textSize="25sp" android:id="@+id/num2"/> <Button android:layout_width="65dp" android:layout_height="65dp" android:text="3" android:background="@drawable/selector" android:gravity="center" android:layout_marginLeft="10dp" android:textSize="25sp" android:id="@+id/num3"/> </LinearLayout> <LinearLayout android:layout_width="wrap_content" android:layout_height="wrap_content" android:orientation="horizontal" android:layout_marginTop="10dp"> <Button android:id="@+id/num0" android:layout_width="140dp" android:layout_height="65dp" android:text="0" android:background="@drawable/selector" android:gravity="center" android:textSize="25sp" /> <Button android:id="@+id/dian" android:layout_width="65dp" android:layout_height="65dp" android:layout_marginLeft="10dp" android:background="@drawable/selector" android:gravity="center" android:text="." android:textSize="25sp" /> </LinearLayout> </LinearLayout> <LinearLayout android:layout_width="wrap_content" android:layout_height="wrap_content"> <Button android:layout_width="65dp" android:layout_height="140dp" android:text="=" android:background="@drawable/equal" android:gravity="center" android:layout_marginLeft="10dp" android:textSize="25sp" android:id="@+id/equai"/> </LinearLayout> </LinearLayout> </LinearLayout>
java代码
package com.example.administrator.calculate;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.LinearLayout;
import android.widget.Toast;
import butterknife.BindView;
import butterknife.ButterKnife;
import butterknife.OnClick;
public class MainActivity extends AppCompatActivity {
@BindView(R.id.input)
EditText input;
@BindView(R.id.clear)
Button clear;
@BindView(R.id.delete)
Button delete;
@BindView(R.id.cheng)
Button cheng;
@BindView(R.id.clu)
Button chu;
@BindView(R.id.num7)
Button num7;
@BindView(R.id.num8)
Button num8;
@BindView(R.id.num9)
Button num9;
@BindView(R.id.charjian)
Button charjian;
@BindView(R.id.num4)
Button num4;
@BindView(R.id.num5)
Button num5;
@BindView(R.id.num6)
Button num6;
@BindView(R.id.charadd)
Button charadd;
@BindView(R.id.num1)
Button num1;
@BindView(R.id.num2)
Button num2;
@BindView(R.id.num3)
Button num3;
@BindView(R.id.num0)
Button num0;
@BindView(R.id.dian)
Button dian;
@BindView(R.id.equai)
Button equal;
private String ss="";
private boolean fu=false;
private boolean num=false;
private boolean point=false;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ButterKnife.bind(this);
}
@OnClick({R.id.clear, R.id.delete, R.id.cheng, R.id.clu, R.id.num7, R.id.num8, R.id.num9, R.id.charjian, R.id.num4, R.id.num5, R.id.num6, R.id.charadd, R.id.num1, R.id.num2, R.id.num3, R.id.num0, R.id.dian, R.id.equai})
public void onViewClicked(View view) {
switch (view.getId()) {
case R.id.clear:
{
ss="";
input.setText(ss);
}
break;
case R.id.delete:
{
if(ss.indexOf(" ")==ss.length()-3)
{
ss= ss.substring(0,ss.length() - 2);
}
if(ss.length()>0)
{
ss= ss.substring(0,ss.length() - 1);
}
input.setText(ss);
}
break;
case R.id.cheng:
{
if(ss.length()==0)
{
break;
}
if(ss.contains(" "))
{
if(ss.indexOf(" ")==ss.length()-3||ss.indexOf(" ")==ss.length()-2||ss.indexOf(" ")==ss.length()-1) break;
getResult();
}
fu=true;
ss+=" × ";
input.setText(ss);
}
break;
case R.id.clu:
{
if(ss.length()==0)
{
break;
}
if(ss.contains(" "))
{
if(ss.indexOf(" ")==ss.length()-3||ss.indexOf(" ")==ss.length()-2||ss.indexOf(" ")==ss.length()-1) break;
getResult();
}
fu=true;
ss+=" ÷ ";
input.setText(ss);
}
break;
case R.id.num7:
{
ss+="7";
input.setText(ss);
}
break;
case R.id.num8:
{
ss+="8";
input.setText(ss);
}
break;
case R.id.num9:
{
ss+="9";
input.setText(ss);
}
break;
case R.id.charjian:
{
if(ss.length()==0)
{
break;
}
if(ss.contains(" "))
{
if(ss.indexOf(" ")==ss.length()-3||ss.indexOf(" ")==ss.length()-2||ss.indexOf(" ")==ss.length()-1) break;
getResult();
}
fu=true;
ss+=" － ";
input.setText(ss);
}
break;
case R.id.num4:
{
ss+="4";
input.setText(ss);
}
break;
case R.id.num5:
{
ss+="5";
input.setText(ss);
}
break;
case R.id.num6:
{
ss+="6";
input.setText(ss);
}
break;
case R.id.charadd:
{
if(ss.length()==0)
{
break;
}
if(ss.contains(" "))
{
if(ss.indexOf(" ")==ss.length()-3||ss.indexOf(" ")==ss.length()-2||ss.indexOf(" ")==ss.length()-1) break;
getResult();
}
fu=true;
ss+=" ＋ ";
input.setText(ss);
}
break;
case R.id.num1:
{
ss+="1";
input.setText(ss);
}
break;
case R.id.num2:
{
ss+="2";
input.setText(ss);
}
break;
case R.id.num3:
{
ss+="3";
input.setText(ss);
}
break;
case R.id.num0:
{
ss+="0";
input.setText(ss);
}
break;
case R.id.dian:
{
if(ss.length()==0||ss.indexOf(" ")==ss.length()-3||ss.lastIndexOf(".")>ss.indexOf(" "))
{
break;
}
else
{
ss+=".";
input.setText(ss);
}
}
break;
case R.id.equai:
getResult();
break;
}
}
private void getResult()
{
double result=0;
if(ss==null||ss.equals("")) return;
if(!ss.contains(" ")) return;
String s1=ss.substring(0,ss.indexOf(" "));
String op=ss.substring(ss.indexOf(" ")+1,ss.indexOf(" ")+2);
String s2=ss.substring(ss.indexOf(" ")+3);
if(!s1.equals("")&&!s2.equals(""))
{
double d1=Double.parseDouble(s1);
double d2=Double.parseDouble(s2 );
switch (op)
{
case "＋": result=d1+d2;break;
case "－": result=d1-d2;break;
case "×": result=d1*d2;break;
case "÷":
{
if(d2==0)
{
Toast.makeText(this, "不能除以零", Toast.LENGTH_SHORT).show();
break;
}
result=d1/d2*1.0;
}
break;
}
int r = (int) result;
if(r==result)
{
input.setText(""+r);
ss=""+r;
}
else
{
input.setText(result+"");
ss=""+result;
}
}
}
}在AndroidManifest.xml文件中activity 后面添加
android:theme=”@style/Theme.AppCompat.DayNight.NoActionBar”
以上是“android studio如何实现计算器”这篇文章的所有内容，感谢各位的阅读！希望分享的内容对大家有帮助，更多相关知识，欢迎关注亿速云行业资讯频道！
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