四则运算（Android版）

MainActivity：

package com.example.demon;

import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.content.Intent;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;

public class MainActivity extends Activity {

private Button b1;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
b1 = (Button) findViewById(R.id.button1);
b1.setOnClickListener(new OnClickListener(){
@Override
public void onClick(View v){
Intent intent = new Intent(MainActivity.this,MainActivity1.class);
startActivity(intent);
}

});
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}

}

MainActivity1：

package com.example.demon;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;

public class MainActivity1 extends Activity{
private Button b2;
private Button b3;
private EditText ed1,ed2;

@Override
protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);
setContentView(R.layout.xuanze);
ed1 = (EditText) findViewById(R.id.editText1);
ed2 = (EditText) findViewById(R.id.editText2);

b2 = (Button) findViewById(R.id.button4);
b3 = (Button) findViewById(R.id.button3);
b2.setOnClickListener(new  ButtonListener());
b3.setOnClickListener(new  ButtonListener1());
}
class ButtonListener implements OnClickListener
{
@Override
public void onClick(View v){
Intent intent = new Intent();
intent.setClass(MainActivity1.this,MainActivity.class);
MainActivity1.this.startActivity(intent);
}
}

class ButtonListener1 implements OnClickListener
{
@Override
public void onClick(View d){
Intent intent1 = new Intent();
String str1 = ed1.getText().toString();
String str2 = ed2.getText().toString();
if ((!"".equals(str1)) && (!"".equals(str2))) {

// Intent的方法，现在把它理解成是一个Map就好了，Map.put(key,value);
intent1.putExtra("num1", str1);
intent1.putExtra("num2", str2);

intent1.setClass(MainActivity1.this,MainActivity2.class);
MainActivity1.this.startActivity(intent1);

}
}

}
}

MainActivity2

：

package com.example.demon;
import java.math.BigDecimal;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity2 extends Activity {
private Button b1;
private Button b2;
private Button b3;
private Button b4;
int z;

private TextView t;
private TextView txtview1;
private EditText edtview1;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main1);
Intent fromPlusIntent = getIntent();
String num1Str = fromPlusIntent.getStringExtra("num1");
String num2Str = fromPlusIntent.getStringExtra("num2");
int num1 = Integer.parseInt(num2Str);
z = num1;
final int num2 = Integer.parseInt(num1Str);
b1 = (Button) findViewById(R.id.button1);
b2 = (Button) findViewById(R.id.button2);
b3 = (Button) findViewById(R.id.button3);
b4 = (Button) findViewById(R.id.button4);
txtview1 = (TextView) findViewById(R.id.tv_2);
edtview1 = (EditText) findViewById(R.id.editText1);
// String str1 = edtview1.getText().toString();
// int num1 = Integer.parseInt(str1);

b4.setOnClickListener(new OnClickListener(){
@Override
public void onClick(View v) {

createf(num2);
t = (TextView) findViewById(R.id.tv_1);
t.setText(sty);
}
});
b3.setOnClickListener(new OnClickListener(){
@Override
public void onClick(View v) {
createf(num2);
t = (TextView) findViewById(R.id.tv_1);
t.setText(sty);
}
});
t = (TextView) findViewById(R.id.tv_1);

t.setText(sty);

b1.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = new Intent(MainActivity2.this,
MainActivity1.class);
startActivity(intent);
}

});
// if (num1 == result) {
b2.setOnClickListener(new OnClickListener() {

@Override
public void onClick(View v) {
z = z-1;
// 点击按钮后设置文字标签
String ansstring = edtview1.getText().toString();
// double num=Double.valueOf(ansstring);
double num = Integer.valueOf(ansstring);
String t = "";

int b = 0;
if (num == f1) {
t = "答对了，真棒";
b=b+1;
} else {
t = "答错了";
}
Toast.makeText(MainActivity2.this, t, Toast.LENGTH_LONG)
.show();
if(z==0)
{

Intent intent = new Intent(MainActivity2.this,
MainActivity3.class);
//                    intent.putExtra("num5", b);
startActivity(intent);
}

}

});

// }
// if (num1 != result) {
// b2.setOnClickListener(new OnClickListener() {
// @Override
// public void onClick(View v) {
// // 点击按钮后设置文字标签
//
// txtview1.setText("答错了");
// // 点击按钮后弹出提示框，里面的参数是（绑定活动，提示内容，显示时间）
// Toast.makeText(MainActivity2.this, "答错了", Toast.LENGTH_LONG)
// .show();
//
// }
//
// });
// }
}

//
// protected void onCreate1(Bundle savedInstanceState) {
// super.onCreate(savedInstanceState);
// setContentView(R.layout.activity_main1);
// b2 = (Button) findViewById(R.id.button2);
// createf();
// t=(TextView)findViewById(R.id.tv_1);
// if(sty!=null) t.setText(sty);
// // b2.setOnClickListener(new OnClickListener() {
// // @Override
// // public void onClick(View v) {
// // Intent intent = new Intent(MainActivity2.this,
// // MainActivity1.class);
// // startActivity(intent);
// // }
// // });
// }

String sty="zzzzz";
double result = 0;
double f1;
String k[]={"+","-","*","/"};
void createf(int num1) {
double x = (int) (Math.random() * num1);
double y = (int) (Math.random() * num1);
double h = (int) (Math.random() * num1);
int i = (int) ((Math.random() * num1)+3);

int z = (int) (Math.random() * 4);
int z1 = (int) (Math.random() * 4);

if ( i == 2 )
{
sty = x + k[z] + y;
if(k[z]=="+")
{result=x+y;}
if(k[z]=="-")
{result=x-y;}
if(k[z]=="*")
{result=x*y;}
if(k[z]=="/")
{result=x/y;}
}
if ( i == 3 )
{
sty = x + k[z] + y +k[z1] + h;
if(k[z]=="+")
{
if(k[z1]=="+")
result = x + y + h ;
if(k[z1]=="-")
result = x + y - h ;
if(k[z1]=="*")
result = x + (y * h) ;
if(k[z1]=="/")
result = x +( y / h );
}
if(k[z]=="-")
{
if(k[z1]=="+")
result = x - y + h ;
if(k[z1]=="-")
result = x - y - h ;
if(k[z1]=="*")
result = x -( y * h) ;
if(k[z1]=="/")
result = x - (y / h) ;
}
if(k[z]=="*")
{
if(k[z1]=="+")
result = (x * y) + h ;
if(k[z1]=="-")
result = (x * y) - h ;
if(k[z1]=="*")
result = (x * y) * h ;
if(k[z1]=="/")
result = (x * y) / h ;
}
if(k[z]=="/")
{
if(k[z1]=="+")
result = (x / y) + h ;
if(k[z1]=="-")
result = (x / y) - h ;
if(k[z1]=="*")
result = (x / y) * h ;
if(k[z1]=="/")
result = (x / y) / h ;}
}

if ( i == 4 )
{
int i1 = (int) (Math.random() * num1);
if(k[z]=="+")
{
if(k[z1]=="+"){
if(i1==0){
sty = "("+x+k[z]+y+")"+k[z1]+z + "=";
result = x + y + h ;
}
if(i1==1){
sty = x+k[z]+"("+y+k[z1]+z +")"+ "=";
result = x + (y + h) ;}
}

if(k[z1]=="-")
{
if(i1==0){
sty = "("+x+k[z]+y+")"+k[z1]+z + "=";
result = x + y - h ;
}
if(i1==1){
sty = x+k[z]+"("+y+k[z1]+z +")"+ "=";
result = x + (y - h) ;}
}
if(k[z1]=="*")
{
if(i1==0){
sty = "("+x+k[z]+y+")"+k[z1]+z + "=";
result = (x + y) * h ;
}
if(i1==1){
sty = x+k[z]+y+k[z1]+z + "=";
result = x + (y * h) ;}
}
if(k[z1]=="/")
{
if(i1==0){
sty = "("+x+k[z]+y+")"+k[z1]+z + "=";
result = (x + y) / h ;
}
if(i1==1){
sty = x+k[z]+y+k[z1]+z + "=";
result = x + (y / h) ;}
}
}
if(k[z]=="-")
{
if(k[z1]=="+")
{
if(i1==0){
sty = "("+x+k[z]+y+")"+k[z1]+z + "=";
result = (x - y) * h ;
}
if(i1==1){
sty = x+k[z]+"("+y+k[z1]+z +")"+ "=";
result = x - (y + h) ;}
}
if(k[z1]=="-")
{
if(i1==0){
sty = "("+x+k[z]+y+")"+k[z1]+z + "=";
result = (x - y) - h ;
}
if(i1==1){
sty = x+k[z]+"("+y+k[z1]+z +")"+ "=";
result = x - (y - h) ;}
}
if(k[z1]=="*")
{
if(i1==0){
sty = "("+x+k[z]+y+")"+k[z1]+z + "=";
result = (x - y) * h ;
}
if(i1==1){
sty = x+k[z]+y+k[z1]+z + "=";
result = x -( y * h) ;}
}
if(k[z1]=="/")
{
if(i1==0){
sty = "("+x+k[z]+y+")"+k[z1]+z + "=";
result = (x - y) / h ;
}
if(i1==1){
sty = x+k[z]+y+k[z1]+z + "=";
result = x - (y / h) ;}
}
}
if(k[z]=="*")
{
if(k[z1]=="+")
{
if(i1==0){
sty = x+k[z]+y+k[z1]+z + "=";
result = x * y + h ;
}
if(i1==1){
sty = x+k[z]+"("+y+k[z1]+z +")"+ "=";
result = x * (y + h) ;}
}
if(k[z1]=="-")
{
if(i1==0){
sty = x+k[z]+y+k[z1]+z + "=";
result = x * y + h ;
}
if(i1==1){
sty = x+k[z]+"("+y+k[z1]+z +")"+ "=";
result = x * (y + h) ;}
}
if(k[z1]=="*")
{
if(i1==0){
sty = x+k[z]+y+k[z1]+z + "=";
result = x * y * h ;
}
if(i1==1){
sty = x+k[z]+"("+y+k[z1]+z +")"+ "=";
result = x * (y * h) ;}
}
if(k[z1]=="/")
{
if(i1==0){
sty = x+k[z]+y+k[z1]+z + "=";
result = x * y / h ;
}
if(i1==1){
sty = x+k[z]+"("+y+k[z1]+z +")"+ "=";
result = x * (y / h) ;}
}
}
if(k[z]=="/")
{
if(k[z1]=="+")
{
if(i1==0){
sty = x+k[z]+y+k[z1]+z + "=";
result = x / y + h ;
}
if(i1==1){
sty = x+k[z]+"("+y+k[z1]+z +")"+ "=";
result = x / (y + h) ;}
}
if(k[z1]=="-")
{
if(i1==0){
sty = x+k[z]+y+k[z1]+z + "=";
result = x / y - h ;
}
if(i1==1){
sty = x+k[z]+"("+y+k[z1]+z +")"+ "=";
result = x / (y - h) ;}
}
if(k[z1]=="*")
{
if(i1==0){
sty = x+k[z]+y+k[z1]+z + "=";
result = x / y * h ;
}
if(i1==1){
sty = x+k[z]+"("+y+k[z1]+z +")"+ "=";
result = x / (y * h) ;}
}
if(k[z1]=="/")
{
if(i1==0){
sty = x+k[z]+y+k[z1]+z + "=";
result = x / y / h ;
}
if(i1==1){
sty = x+k[z]+"("+y+k[z1]+z +")"+ "=";
result = x / (y / h) ;}
}
}

}
BigDecimal bg = new BigDecimal(result);
f1 = bg.setScale(2, BigDecimal.ROUND_HALF_UP).doubleValue();

}

// {
// Button btn = (Button) findViewById(R.id.button3);// 获取按钮
// btn.setOnClickListener(new View.OnClickListener() { // 设置按钮单击事件
// @Override
// public void onClick(View v) {
//
// TextView tv = (TextView) findViewById(R.id.editText2);// 获取textview组件
//
// tv.setText(sty);// 在textview中显示
// }
// });
// }

}

package com.example.demon;

import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.content.Intent;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;

public class MainActivity3  extends Activity{
private Button b1;
private Button b2;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main2);
b1 = (Button) findViewById(R.id.button1);
b2 = (Button) findViewById(R.id.button2);
//        Intent fromPlusIntent = getIntent();
//        String num1Str = fromPlusIntent.getStringExtra("num5");
//        int num2 = Integer.parseInt(num1Str);
//        TextView t = (TextView) findViewById(R.id.textView1);
//            t.setText(num2);
b1.setOnClickListener(new OnClickListener(){
@Override
public void onClick(View v){
Intent intent = new Intent(MainActivity3.this,MainActivity1.class);
startActivity(intent);
}

});
b2.setOnClickListener(new OnClickListener(){
@Override
public void onClick(View v){
Intent intent = new Intent(MainActivity3.this,MainActivity.class);
startActivity(intent);
}

});
}

}