小学四则运算APP 第三阶段冲刺
2024-03-24 17:46:57
<?xml version="1.0" encoding="utf-8"?>
<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:scrollbars="vertical"
android:paddingBottom="10dp"
android:paddingTop="5dp"
android:background="@drawable/b1">
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical"
android:paddingLeft="8dp"
android:paddingRight="8dp">
<RelativeLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<EditText
android:id="@+id/editText"
android:layout_width="fill_parent"
android:layout_height="90dp"
android:autoText="true"
android:hint="@string/editText_hint_text"
android:minHeight="60dp"
android:background="@drawable/selector"
android:paddingTop="10dp"
android:paddingBottom="15dp"
android:singleLine="false"
android:scrollbars="vertical"/>
<TextView
android:id="@+id/tv"
android:layout_alignRight="@id/editText"
android:layout_alignBottom="@id/editText"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/kong"
android:textColor="#CD0000"/>
</RelativeLayout>
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="horizontal"
android:paddingTop="10dip"
android:paddingBottom="5dp" >
<Button
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:text="("
android:layout_weight="1"
android:textSize="30sp"
android:background="@drawable/selector"
android:id="@+id/left"
android:textStyle="bold"
android:layout_marginRight="5dp"/>
<Button
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:text=")"
android:layout_weight="1"
android:textSize="30sp"
android:background="@drawable/selector"
android:id="@+id/right"
android:textStyle="bold"
android:layout_marginRight="5dp"
/>
<Button
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:text="Clean"
android:layout_weight="1"
android:background="@drawable/selector"
android:id="@+id/ac"
android:textStyle="bold"
android:layout_marginRight="5dp"
/>
<Button
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:text="Backspace"
android:layout_weight="1"
android:background="@drawable/selector"
android:id="@+id/bs"
android:textStyle="bold" /> </LinearLayout>
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:paddingBottom="5dp"> <Button
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:text="7"
android:layout_weight="1"
android:textSize="30sp"
android:background="@drawable/selector"
android:id="@+id/num7"
android:textStyle="bold"
android:layout_marginRight="5dp"/>
<Button
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:text="8"
android:layout_weight="1"
android:textSize="30sp"
android:background="@drawable/selector"
android:id="@+id/num8"
android:textStyle="bold"
android:layout_marginRight="5dp"/>
<Button
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:text="9"
android:layout_weight="1"
android:textSize="30sp"
android:background="@drawable/selector"
android:id="@+id/num9"
android:textStyle="bold"
android:layout_marginRight="5dp"/>
<Button
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:text="÷"
android:layout_weight="1"
android:textSize="30sp"
android:background="@drawable/selector"
android:id="@+id/divide"
android:textStyle="bold"
/>
</LinearLayout>
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="horizontal"
android:layout_weight="1"
android:paddingBottom="5dp"> <Button
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:text="4"
android:layout_weight="1"
android:textSize="30sp"
android:background="@drawable/selector"
android:id="@+id/num4"
android:textStyle="bold"
android:layout_marginRight="5dp"/>
<Button
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:text="5"
android:layout_weight="1"
android:textSize="30sp"
android:background="@drawable/selector"
android:id="@+id/num5"
android:textStyle="bold"
android:layout_marginRight="5dp"/>
<Button
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:text="6"
android:layout_weight="1"
android:textSize="30sp"
android:background="@drawable/selector"
android:id="@+id/num6"
android:textStyle="bold"
android:layout_marginRight="5dp"/>
<Button
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:text="×"
android:layout_weight="1"
android:textSize="30sp"
android:background="@drawable/selector"
android:id="@+id/mul"
android:textStyle="bold"
/>
</LinearLayout>
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="horizontal"
android:layout_weight="1"
android:paddingBottom="5dp"> <Button
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:text="1"
android:layout_weight="1"
android:textSize="30sp"
android:background="@drawable/selector"
android:id="@+id/num1"
android:textStyle="bold"
android:layout_marginRight="5dp"/>
<Button
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:text="2"
android:layout_weight="1"
android:textSize="30sp"
android:background="@drawable/selector"
android:id="@+id/num2"
android:textStyle="bold"
android:layout_marginRight="5dp"/>
<Button
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:text="3"
android:layout_weight="1"
android:background="@drawable/selector"
android:textSize="30sp"
android:id="@+id/num3"
android:textStyle="bold"
android:layout_marginRight="5dp"/>
<Button
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:text="－"
android:textSize="35sp"
android:layout_weight="1"
android:background="@drawable/selector"
android:id="@+id/sub"
android:textStyle="bold"
/>
</LinearLayout>
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="horizontal"
android:layout_weight="1"
android:paddingBottom="5dp"
> <Button
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:text="0"
android:layout_weight="1"
android:textSize="30sp"
android:background="@drawable/selector"
android:id="@+id/num0"
android:textStyle="bold"
android:layout_marginRight="5dp"/>
<Button
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:text="."
android:layout_weight="1"
android:textSize="30sp"
android:background="@drawable/selector"
android:id="@+id/pot"
android:textStyle="bold"
android:layout_marginRight="5dp"/>
<Button
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:text="+"
android:layout_weight="1"
android:textSize="30sp"
android:background="@drawable/selector"
android:id="@+id/add"
android:textStyle="bold"
android:layout_marginRight="5dp"/>
<Button
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="="
android:layout_weight="1"
android:textSize="30sp"
android:background="@drawable/selector"
android:id="@+id/equ"
android:textStyle="bold"
/>
</LinearLayout>
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="horizontal"
android:layout_weight="1"
android:paddingBottom="5dp">
<Button
android:id="@+id/minus"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:text="+/-"
android:layout_weight="1"
android:textSize="30sp"
android:background="@drawable/selector"
android:textStyle="bold"
android:layout_marginRight="5dp"/> </LinearLayout>
</LinearLayout>
</ScrollView>
Calculator.java
package com.manymore13.calc; import java.math.BigDecimal;
import java.util.EmptyStackException;
import java.util.Stack; import android.util.Log; // 测试匹配否
// 特殊加减乘除 ＋ － × ÷
// 特殊正负 ﹢﹣
// 普通加减乘除正负 + - * / + -
public class Calculator { private static String expression; // 后缀式
private String suffix; // 特殊左括号
final static char LEFT_NORMAL = '﹙';
// 特殊右括号
final static char RIGHT_NORMAL = '﹚';
// 特殊负号
final static char MINUS = '﹣';
// 特殊加号
final static char ADD = '＋';
// 特殊乘法
final static char MUL = '×';
// 特殊除法
final static char DIV = '÷';
// 特殊减法
final static char SUB = '－';
// 特殊等于号
final static char equ = '＝'; public static String getExpression() {
return expression;
} // 返回后缀
public String getSuffix() {
return suffix;
} public void setExpression(String equation) {
expression = equation;
createSuffix(); } public Calculator(String equation)
{
expression = equation;
createSuffix();
} public Calculator()
{
expression = "";
suffix = "";
} /**
* 判断括号有没有匹配
* 匹配方法：遇到左括号进栈，遇到右括号出栈并且比对出栈的括号
*
*/
public boolean isBalanced()
{ Stack<Character> store = new Stack<Character>();
store.clear();
char c;
for(int i=0; i<expression.length(); i++)
{
c = expression.charAt(i);
switch(c)
{ case LEFT_NORMAL:
{
store.push(expression.charAt(i));
break;
}
case RIGHT_NORMAL:
{
if(store.isEmpty() || store.pop()!= LEFT_NORMAL)
{
return false;
}
break; } }
}
if(store.isEmpty())
{
return true;
}
else
{
return false;
} } private static boolean isOperator(char ope)
{
if(ope == ADD || ope==SUB
||ope == MUL || ope == DIV)
{
return true;
}
return false;
} private static boolean isNum(char c)
{
if(c>='0' && c<='9')
{
return true;
}
return false;
}
// 中缀式转后缀式
public String createSuffix()
{
Stack<String> stack = new Stack<String>();
String exp = expression.trim();
String suf = "";
int i = 0;
char c;
while(i < exp.length())
{
c = exp.charAt(i);
if(c == LEFT_NORMAL) // 左括号
{
stack.push(LEFT_NORMAL+"");
}
else if(isFit(c)) // 符合数字的一部分
{
String num = ""; while(i<exp.length() && isFit(exp.charAt(i)) )
{ num+=exp.charAt(i);
i++;
}
suf += (num + " "); //后缀
i--;
}else if(c == ADD || c == SUB || c == MUL ||c == DIV) // 运算符
{
while(true)
{
if(stack.isEmpty())
{
break;
}
if(stack.peek().equals(""+LEFT_NORMAL))
{
break;
}
if(compare(stack.peek().charAt(0),c))
{
break;
}
suf += (stack.pop()+" "); // 后缀
}
stack.push(c+"");
}
else if(c == RIGHT_NORMAL)
{
while(!stack.isEmpty())
{
if(stack.peek().equals(""+LEFT_NORMAL))
{
stack.pop();
break;
}
suf += (stack.pop() + " "); // 后缀
} }
i++; }
while(!stack.isEmpty())
{
suf += (stack.pop() + " "); // 后缀
}
this.suffix = suf;
return suf; } /**
* 判断是否符合数字的一部分
* @param digit
* @return 符合返回true 否则返回false
*/
private boolean isFit(char digit)
{
if(digit>='0' && digit<='9'||digit ==MINUS||digit=='.' )
{
return true;
}
return false;
} // 栈中运算符与将要读取的运算符作比较
// 返回true指示栈中运算符优先级大于将要读取运算符
// 其他的低于或等于都返回false
private boolean compare(char stackOpe, char nextOpe)
{
int v1 = value(stackOpe);
int v2 = value(nextOpe);
if( v1 < v2)
{
return true;
}
return false;
} // 运算符优先级
private int value(char ope)
{
if(ope==ADD || ope==SUB)
{
return 1;
}
else if(ope==MUL || ope==DIV)
{
return 2;
}
else
{
return 0;
}
} /**
* @param suffix 后缀式
* @return 利用后缀式算出结果
*/
public String getResult()
{
suffix = suffix.replace(MINUS, '-');
String[] str = suffix.split(" ");
Stack<String> valueStack = new Stack<String>();
for(int i=0; i<str.length; i++)
{
// 遇到运算符出栈
if(str[i].equals(ADD+"") || str[i].equals(SUB+"")
|| str[i].equals(MUL+"") || str[i].equals(DIV+""))
{
String rightNum;
String leftNum;
try
{
rightNum = valueStack.pop();
leftNum = valueStack.pop();
String result = calc(leftNum,rightNum,str[i]);
valueStack.push(result);
}catch(EmptyStackException empty)
{
return "算式出现异常";
} }
else
{
// 遇到数字进栈
valueStack.push(str[i]);
}
}
if(!valueStack.isEmpty())
{
return valueStack.pop();
}
return "栈为空 ，出现错误！";
} public static String calc(String leftNum, String rightNum, String ope)
{
BigDecimal bigLeftNum = null;
BigDecimal bigRightnum = null;
try
{
bigLeftNum = new BigDecimal(leftNum);
bigRightnum = new BigDecimal(rightNum);
}catch(NumberFormatException e)
{
return "算式出现异常";
}
switch(ope.charAt(0))
{
// 处理加法
case ADD:return bigLeftNum.add(bigRightnum).toString();
// 处理减法
case SUB:return bigLeftNum.subtract(bigRightnum).toString();
// 处理乘法
case MUL:return bigLeftNum.multiply(bigRightnum).toString();
// 处理乘法
case DIV:
{
if(bigRightnum.doubleValue()==0)
{
return "除数为零";
}
// 20为小数点后的位数
String result = bigLeftNum.divide(bigRightnum,20,BigDecimal.ROUND_DOWN).toString();
int mark = 0;
if( (mark = result.indexOf('.'))!=-1)
{
for(int i=mark; i<result.length(); i++)
{
if(result.charAt(i)!='0')
{
mark = i;
}
}
Log.d("mark--1 :", mark+"");
if(result.charAt(mark)=='.')
{
mark -= 1;
}
Log.d("mark--2 :", mark+""); Log.d("result", result.substring(0,mark+1));
result = result.substring(0,mark+1);
return result;
}
else
{
return result;
} }
}
return null;
} // 测试括号匹配 - —
public static void main(String[] s)
{
String str1 = "﹙5.3＋3﹚×﹙3＋8﹚";
String str2 = "[{}]{}";
String str3 = "({}{})";
String str4 = "16.2+(6.72-4.25)-3.72";
String str5 = "(((10+7)*(20/30))-(2*40))";
String str6 = "12"; Calculator cal = new Calculator(str1);
System.out.println("匹配："+cal.isBalanced());
System.out.println("后缀："+cal.getSuffix());
String reult = cal.getResult();
System.out.println("结果: "+reult); }
}
MycalcActivity.java
package com.manymore13.calc; import java.util.ArrayList;
import java.util.Collections;
import java.util.List; import android.app.Activity;
import android.app.AlertDialog;
import android.content.Context;
import android.os.Bundle;
import android.text.Editable;
import android.text.TextWatcher;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.View.OnFocusChangeListener;
import android.view.inputmethod.InputMethodManager;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView; public class MyCalcActivity extends Activity { AlertDialog.Builder mBuilder ;
private List<Button> buttonList = new ArrayList<Button>(25);
private Button[] num = new Button[10];
private Calculator cal = new Calculator();
private TextView tviewPrompt;
private boolean legal = true;
int[] Idnum = new int[]
{
R.id.num0,
R.id.num1,
R.id.num2,
R.id.num3,
R.id.num4,
R.id.num5,
R.id.num6,
R.id.num7,
R.id.num8,
R.id.num9
};
private static EditText edit;
private Button btnAdd;
private Button btnSub;
private Button btnMul;
private Button btnDiv;
private Button btnPot;
private Button btnEqu;
private Button btnBC;
private Button btnAC;
private Button btnLeft;
private Button btnRight;
private Button btnMinus; // 负号 private Button btnMoveLeft;
private Button btnMoveRight;
public static EditText getEdit()
{
return edit;
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
this.findView(); // 屏蔽软键盘 这样做有个弊端，就是不能自动换行
// edit.setInputType(InputType.TYPE_NULL);
// edit.setInputType(InputType.TYPE_DATETIME_VARIATION_NORMAL); edit.addTextChangedListener(new TextWatcher() {
String str;
@Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
str = s.toString();
cal.setExpression(str); if(str.equals("")||(str.indexOf(Calculator.LEFT_NORMAL)==-1
&&str.indexOf(Calculator.RIGHT_NORMAL)==-1))
{
legal = true;
tviewPrompt.setText(R.string.kong);
}else if(cal.isBalanced())
{
System.out.println(cal.isBalanced());
legal = true;
tviewPrompt.setText(R.string.legal);
}else
{
legal = false;
tviewPrompt.setText(R.string.wrongful);
} } @Override
public void beforeTextChanged(CharSequence s, int start, int count,
int after) {
} @Override
public void afterTextChanged(Editable s) { }
});
for(Button current:buttonList)
{
System.out.println(current.getText());
current.setOnClickListener(new btnOnclickListtenner());
} // 屏蔽软键盘
edit.setOnClickListener(new OnClickListener() { @Override
public void onClick(View v) { InputMethodManager imm = (InputMethodManager)getSystemService(Context.INPUT_METHOD_SERVICE);
imm.hideSoftInputFromWindow(edit.getWindowToken(), 0);
edit.setBackgroundColor(0x7f48D1CC); }
}); edit.setOnFocusChangeListener(new OnFocusChangeListener() { @Override
public void onFocusChange(View v, boolean hasFocus) {
InputMethodManager imm = (InputMethodManager)getSystemService(Context.INPUT_METHOD_SERVICE);
imm.hideSoftInputFromWindow(edit.getWindowToken(), 0);
edit.setBackgroundColor(0x7f48D1CC); }
}); } public void findView()
{
// 获取算式框的实例
edit = (EditText)findViewById(R.id.editText);
// 获取数字按钮的实例
for(int i=0; i<=9; i++)
{
num[i] = (Button)findViewById(Idnum[i]);
} tviewPrompt = (TextView)findViewById(R.id.tv);
Collections.addAll(buttonList, num); btnAdd = (Button)findViewById(R.id.add);
Collections.addAll(buttonList,btnAdd); btnSub = (Button)findViewById(R.id.sub);
Collections.addAll(buttonList,btnSub); btnMul = (Button)findViewById(R.id.mul);
Collections.addAll(buttonList,btnMul); btnDiv = (Button)findViewById(R.id.divide);
Collections.addAll(buttonList,btnDiv); btnPot = (Button)findViewById(R.id.pot);
Collections.addAll(buttonList,btnPot); btnEqu = (Button)findViewById(R.id.equ);
Collections.addAll(buttonList,btnEqu); btnBC = (Button)findViewById(R.id.bs);
Collections.addAll(buttonList,btnBC); btnAC = (Button)findViewById(R.id.ac);
Collections.addAll(buttonList,btnAC); btnLeft = (Button)findViewById(R.id.left);
Collections.addAll(buttonList, btnLeft); btnRight = (Button)findViewById(R.id.right);
Collections.addAll(buttonList, btnRight); btnMinus = (Button)findViewById(R.id.minus);
Collections.addAll(buttonList, btnMinus); } class btnOnclickListtenner implements OnClickListener
{ @Override
public void onClick(View v)
{
// 获取EditText的编辑版
Editable edtTable = edit.getText(); // 获取光标位置
int where = edit.getSelectionStart();
String inputData = "";
switch(v.getId())
{
case R.id.num0:
{
inputData = "0";
break;
}
case R.id.num1:
{
inputData = "1";
break;
}
case R.id.num2:
{
inputData = "2";
break;
}
case R.id.num3:
{
inputData = "3";
break;
}
case R.id.num4:
{
inputData = "4";
break;
}
case R.id.num5:
{
inputData = "5";
break;
}
case R.id.num6:
{
inputData = "6";
break;
}
case R.id.num7:
{
inputData = "7";
break;
}
case R.id.num8:
{
inputData = "8";
break;
}
case R.id.num9:
{
inputData = "9";
break;
}
// 全部清除
case R.id.ac:
{
inputData = "";
edit.setText("");
}
// 退格键
case R.id.bs:
{
if(where >0)
{
edtTable.delete(where-1, where);
}
break;
}
case R.id.add:
{
inputData = Calculator.ADD+"";
break;
}
case R.id.sub:
{
inputData = Calculator.SUB+"";
break;
}
case R.id.mul:
{
inputData = Calculator.MUL+"";
break;
}
case R.id.divide:
{
inputData = Calculator.DIV+"";
break;
}
case R.id.pot:
{
inputData = ".";
break;
}
case R.id.left:
{
inputData = Calculator.LEFT_NORMAL+"";
break;
}
case R.id.right:
{
inputData = Calculator.RIGHT_NORMAL+"";
break;
}
case R.id.minus:
{
inputData = Calculator.MINUS+"";
break;
}
// 处理光标左移 //处理等于
case R.id.equ:
{ inputData = "";
String str = edtTable.toString();
where = str.length();
if(checkLegal(str))
{
cal.setExpression(edtTable.toString());
String result = cal.getResult();
inputData = "\n"+Calculator.equ+result; }
break; }
} edtTable.insert(where, inputData);
}
// 检查运算式是否合格
public boolean checkLegal(String exp)
{
if( (legal && (!exp.equals(""))&&(exp.indexOf(Calculator.equ)==-1))
&&(exp.indexOf(Calculator.ADD)!=-1 ||exp.indexOf(Calculator.SUB)!=-1
||exp.indexOf(Calculator.MUL)!=-1 ||exp.indexOf(Calculator.DIV)!=-1))
{
return true;
}
return false;
} } public boolean onCreateOptionsMenu(Menu menu)
{
menu.add(0,1,0,"关于");
menu.add(1,2,1,"退出");
return true; // 这里要返回true 否则菜单不显示
}
@Override
public boolean onOptionsItemSelected(MenuItem item)
{
mBuilder = new AlertDialog.Builder(this); if(item.getItemId()==1)
{
mBuilder.setMessage(R.string.abount).setTitle("关 于").show().setInverseBackgroundForced(true);
} else
{
finish();
}
return super.onOptionsItemSelected(item);
}
}
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