package com.example.wang.jisuanji;
import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
public class Main2Activity
extends Activity {
//单目运算可以实现连续进行，实现不了运算符之间的运算
String str = ""
;
String str1=""
;
String str2=""
;
String string=""
;
String stringq=""
;
String stringh=""
;
String[] strings=
new String[200
];
String[] strings1=
new String[200
];
TextView input;
TextView output;
Button bt_0;
Button bt_1;
Button bt_2;
Button bt_3;
Button bt_4;
Button bt_5;
Button bt_6;
Button bt_7;
Button bt_8;
Button bt_9;
Button bt_jia;
Button bt_jian;
Button bt_cheng;
Button bt_chu;
Button bt_DEL;
Button bt_C;
Button bt_dian;
Button bt_deng;
int i, j;
int g =0
;
int k=0
;
double a = 0
;
double b = 0
;
double c=0
;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main2);
input =
(TextView) findViewById(R.id.input);
output =
(TextView) findViewById(R.id.output);
bt_0 =
(Button) findViewById(R.id.bt_0);
bt_1 =
(Button) findViewById(R.id.bt_1);
bt_2 =
(Button) findViewById(R.id.bt_2);
bt_3 =
(Button) findViewById(R.id.bt_3);
bt_4 =
(Button) findViewById(R.id.bt_4);
bt_5 =
(Button) findViewById(R.id.bt_5);
bt_6 =
(Button) findViewById(R.id.bt_6);
bt_7 =
(Button) findViewById(R.id.bt_7);
bt_8 =
(Button) findViewById(R.id.bt_8);
bt_9 =
(Button) findViewById(R.id.bt_9);
bt_jia =
(Button) findViewById(R.id.bt_jia);
bt_jian =
(Button) findViewById(R.id.bt_jian);
bt_cheng =
(Button) findViewById(R.id.bt_cheng);
bt_chu =
(Button) findViewById(R.id.bt_chu);
bt_dian =
(Button) findViewById(R.id.bt_dian);
bt_DEL =
(Button) findViewById(R.id.bt_DEL);
bt_C =
(Button) findViewById(R.id.bt_C);
bt_deng =
(Button) findViewById(R.id.bt_deng);
Bt_OnClickListener bt_onClickListener =
new Bt_OnClickListener();
bt_0.setOnClickListener(bt_onClickListener);
bt_1.setOnClickListener(bt_onClickListener);
bt_2.setOnClickListener(bt_onClickListener);
bt_3.setOnClickListener(bt_onClickListener);
bt_4.setOnClickListener(bt_onClickListener);
bt_5.setOnClickListener(bt_onClickListener);
bt_6.setOnClickListener(bt_onClickListener);
bt_7.setOnClickListener(bt_onClickListener);
bt_8.setOnClickListener(bt_onClickListener);
bt_9.setOnClickListener(bt_onClickListener);
bt_dian.setOnClickListener(bt_onClickListener);
//bt_jia.setOnClickListener(bt_onClickListener);
bt_C.setOnClickListener(
new View.OnClickListener() {
@Override
public void onClick(View v) {
str = "0"
;
input.setText(str);
str = ""
;
output.setText(""
);
string=""
;
a=0
;
k=g=0
;
}
});
bt_jia.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Button bt =
(Button) v;
str1 = str;
//str1放前一个数据
// string = str;//存放加号以前的数据
str = str +
bt.getText().toString();
strings[g]=
str;
Log.e("TAG","strings["+g+"]="+
strings[g]);
g++
;
input.setText(str);
stringq=
string;
if (i==1
)
{
// a = a-Double.parseDouble(stringq);
if (a==0
)
{
a =Double.parseDouble(stringq)-
a;
}
else
{
Log.e("TAG","jianss_a="+
a);
a =a-
Double.parseDouble(stringq);
}
}
else if (i==2
)
{
if (a==0
)
{
a=a+1
;
}
a = Double.parseDouble(stringq)*
a;
}
else if(i==3
)
{
if (a==0
)
{
a=a+1
;
a = Double.parseDouble(stringq)/
a;
}
else
{
a =a/
Double.parseDouble(stringq);
}
}
else if (i==3
)
{
if (a==0
)
{
a=a+1
;
a = Double.parseDouble(stringq)/
a;
}
else
{
a =a/
Double.parseDouble(stringq);
}
}
else
{
a = Double.parseDouble(stringq)+
a;
}
string=""
;
i = jia();
//返回一个0
}
});
bt_jian.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Button bt =
(Button) v;
str1 = str;
//str1放前一个数据
// string = str;//存放加号以前的数据
str = str +
bt.getText().toString();
strings[g]=
str;
Log.e("TAG","strings["+g+"]="+
strings[g]);
g++
;
input.setText(str);
stringq=
string;
if (a==0
)
{
a =Double.parseDouble(stringq)-
a;
}
else if (i==0
)
{
Log.e("TAG","jian1_a="+
a);
a =a+
Double.parseDouble(stringq);
}
else if (i==2
)
{
if (a==0
)
{
a=a+1
;
}
a = Double.parseDouble(stringq)*
a;
}
else if(i==3
)
{
if (a==0
)
{
a=a+1
;
Log.e("TAG","a==="+
a);
a = Double.parseDouble(stringq)/
a;
Log.e("TAG","a===1"+
a);
}
else
{
Log.e("TAG","a=="+
a);
a =a/
Double.parseDouble(stringq);
Log.e("TAG","a==1"+
a);
}
}
else if (i==3
)
{
if (a==0
)
{
a=a+1
;
a = Double.parseDouble(stringq)/
a;
}
else
{
a =a/
Double.parseDouble(stringq);
}
}
else
{
Log.e("TAG","jian_a="+
a);
a =a-
Double.parseDouble(stringq);
}
Log.e("TAG", "jian_a1=" +
a);
i = jian();
//返回一个0
string=""
;
}
});
bt_cheng.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Button bt =
(Button) v;
str1 = str;
//str1放前一个数据
// string = str;//存放加号以前的数据
str = str +
bt.getText().toString();
strings[g]=
str;
Log.e("TAG","stringscheng["+g+"]="+
strings[g]);
g++
;
input.setText(str);
stringq=
string;
Log.e("TAG","stringscheng1["+g+"]="+
string);
if (a==0
)
{
a=a+1
;
a=a*
Double.parseDouble(stringq);
}
else if (i==0
)
{
//Log.e("TAG","jianqwe_a="+a);
a =a+
Double.parseDouble(stringq);
//Log.e("TAG","jianqweqq_a="+a);
}
else if (i==1
)
{
if (a==0
)
{
a =Double.parseDouble(stringq)-
a;
}
else
{
Log.e("TAG","jian_a="+
a);
a =a-
Double.parseDouble(stringq);
}
}
else if(i==3
)
{
if (a==0
)
{
a=a+1
;
a = Double.parseDouble(stringq)/
a;
}
else
{
a =a/
Double.parseDouble(stringq);
//Log.e("TAG","stringDEL2="+string);
}
}
else
{
a = Double.parseDouble(stringq)*
a;
}
string=""
;
i =
cheng();
}
});
bt_chu.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Button bt =
(Button) v;
str1 = str;
//str1放前一个数据
// string = str;//存放加号以前的数据
str = str +
bt.getText().toString();
strings[g]=
str;
Log.e("TAG","strings["+g+"]="+
strings[g]);
g++
;
input.setText(str);
stringq=
string;
if (a==0
)
{
a=a+1
;
a = Double.parseDouble(stringq)/
a;
}
else if (i==0
)
{
Log.e("TAG","jian1_a="+
a);
a =a+
Double.parseDouble(stringq);
}
else if (i==2
)
{
if (a==0
)
{
a=a+1
;
}
a = Double.parseDouble(stringq)*
a;
}
else if (i==1
)
{
if (a==0
)
{
a =Double.parseDouble(stringq)-
a;
}
else
{
Log.e("TAG","jian_a="+
a);
a =a-
Double.parseDouble(stringq);
}
}
else
{
a =a/
Double.parseDouble(stringq);
}
// string="";
// string1 = "";//存放加号以后的数据
// //23+23+45=
string=""
;
i = chu();
//返回一个0
}
});
bt_deng.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Button bt =
(Button) v;
str1 = str;
//str1放前一个数据
str = str +
bt.getText().toString();
strings[g]=
str;
Log.e("TAG","strings["+g+"]="+
strings[g]);
g++
;
input.setText(str);
deng(i);
str = "" + c;
//使下一次输入时显示页面为c
}
});
bt_DEL.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Log.e("TAG", "stringsDEL[" + g + "]=" + strings[g - 2
]);
input.setText(strings[g - 2
]);
str=strings[g-2
];
g--
;
//string=str2;
string=strings1[k-1
];
Log.e("TAG","stringDEL="+
string);
k--
;
}
});
}
class Bt_OnClickListener
implements View.OnClickListener {
@Override
public void onClick(View v) {
Button bt =
(Button) v;
str1 = str;
//str1放前一个数据
str = str +
bt.getText().toString();
strings[g]=
str;
Log.e("TAG","strings["+g+"]="+
strings[g]);
g++
;
input.setText(str);
// if (DEL_OnClick(v)==8)
// {
// string=str2;
// }
str2=
string;
strings1[k]=
str2;
Log.e("TAG", "strings1111[" + k + "]=" +
strings1[k]);
k++
;
string = string +
bt.getText().toString();
//str2=bt.getText().toString();
output.setText(""
);
}
}
public int jia() {
return 0
; }
public int jian() {
return 1
; }
public int cheng() {
return 2
; }
public int chu() {
return 3
; }
//结果
public void deng(
int i) {
if (i == 0) {
//执行加法
stringh=
string;
b =
Double.parseDouble(stringh);
c = a+
b;
}
if (i == 1
) {
stringh=
string;
b =
Double.parseDouble(stringh);
c = a-
b;
}
if (i == 2
) {
stringh=
string;
b =
Double.parseDouble(stringh);
c = a*
b;
}
if (i == 3
) {
stringh=
string;
b =
Double.parseDouble(stringh);
c = (
double)a/
b;
}
output.setText("" +
c);
}
}
java
<?xml version="1.0" encoding="utf-8"?>
<GridLayout 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:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="com.example.wang.jisuanji.MainActivity"
android:rowCount="6"
android:columnCount="4">
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#ccc"
android:layout_columnSpan="4"
android:layout_rowWeight="1"
android:textSize="40sp"
android:gravity="right|center_vertical"
android:id="@+id/input"/>
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#ccc"
android:layout_columnSpan="4"
android:layout_rowWeight="1"
android:textSize="40sp"
android:gravity="right|center_vertical"
android:id="@+id/output"/>
<Button
android:layout_width="0dp"
android:layout_height="0dp"
android:text="C"
android:textSize="25sp"
android:id="@+id/bt_C"
android:layout_columnWeight="1"
android:layout_rowWeight="1"/>
<Button
android:layout_width="0dp"
android:layout_height="0dp"
android:text="DEL"
android:textSize="25sp"
android:id="@+id/bt_DEL"
android:layout_columnWeight="1"
android:layout_rowWeight="1"/>
<Button
android:layout_width="0dp"
android:layout_height="0dp"
android:text="÷"
android:textSize="25sp"
android:id="@+id/bt_chu"
android:layout_columnWeight="1"
android:layout_rowWeight="1"/>
<Button
android:layout_width="0dp"
android:layout_height="0dp"
android:text="×"
android:textSize="25sp"
android:id="@+id/bt_cheng"
android:layout_columnWeight="1"
android:layout_rowWeight="1"/>
<Button
android:layout_width="0dp"
android:layout_height="0dp"
android:text="7"
android:textSize="25sp"
android:id="@+id/bt_7"
android:layout_columnWeight="1"
android:layout_rowWeight="1"/>
<Button
android:layout_width="0dp"
android:layout_height="0dp"
android:text="8"
android:textSize="25sp"
android:id="@+id/bt_8"
android:layout_columnWeight="1"
android:layout_rowWeight="1"/>
<Button
android:layout_width="0dp"
android:layout_height="0dp"
android:text="9"
android:textSize="25sp"
android:id="@+id/bt_9"
android:layout_columnWeight="1"
android:layout_rowWeight="1"/>
<Button
android:layout_width="0dp"
android:layout_height="0dp"
android:text="-"
android:textSize="25sp"
android:id="@+id/bt_jian"
android:layout_columnWeight="1"
android:layout_rowWeight="1"/>
<Button
android:layout_width="0dp"
android:layout_height="0dp"
android:text="4"
android:textSize="25sp"
android:id="@+id/bt_4"
android:layout_columnWeight="1"
android:layout_rowWeight="1"/>
<Button
android:layout_width="0dp"
android:layout_height="0dp"
android:text="5"
android:textSize="25sp"
android:id="@+id/bt_5"
android:layout_columnWeight="1"
android:layout_rowWeight="1"/>
<Button
android:layout_width="0dp"
android:layout_height="0dp"
android:text="6"
android:textSize="25sp"
android:id="@+id/bt_6"
android:layout_columnWeight="1"
android:layout_rowWeight="1"/>
<Button
android:layout_width="0dp"
android:layout_height="0dp"
android:text="+"
android:onClick="jia_OnClick"
android:textSize="25sp"
android:id="@+id/bt_jia"
android:layout_columnWeight="1"
android:layout_rowWeight="1"/>
<Button
android:layout_width="0dp"
android:layout_height="0dp"
android:text="1"
android:textSize="25sp"
android:id="@+id/bt_1"
android:layout_columnWeight="1"
android:layout_rowWeight="1"/>
<Button
android:layout_width="0dp"
android:layout_height="0dp"
android:text="2"
android:textSize="25sp"
android:id="@+id/bt_2"
android:layout_columnWeight="1"
android:layout_rowWeight="1"/>
<Button
android:layout_width="0dp"
android:layout_height="0dp"
android:text="3"
android:textSize="25sp"
android:id="@+id/bt_3"
android:layout_columnWeight="1"
android:layout_rowWeight="1"/>
<Button
android:layout_width="0dp"
android:layout_height="0dp"
android:text="="
android:textSize="25sp"
android:id="@+id/bt_deng"
android:onClick="deng_OnClick"
android:layout_rowSpan="2"
android:layout_columnWeight="1"
android:layout_rowWeight="1"/>
<Button
android:layout_width="0dp"
android:layout_height="0dp"
android:text="0"
android:textSize="25sp"
android:layout_columnSpan="2"
android:id="@+id/bt_0"
android:layout_columnWeight="1"
android:layout_rowWeight="1"/>
<Button
android:layout_width="0dp"
android:layout_height="0dp"
android:text="."
android:textSize="40sp"
android:id="@+id/bt_dian"
android:layout_columnWeight="1"
android:layout_rowWeight="1"/>
</GridLayout>
xml
后退功能
转载于:https://www.cnblogs.com/wangchuanqi/p/5503553.html
相关资源：Visual C 2005入门经典--源代码及课后练习答案
