android studio实现计算器

<?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 

<?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 

<?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 

<?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 

<?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 

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;
}
}
}
}

android:theme=”@style/Theme.AppCompat.DayNight.NoActionBar”