下面是效果展示：
代码如下:
package com.example.week2;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;
import android.app.Activity;
public class MainActivity extends Activity implements OnClickListener{
//声明一些控件
Button btn0=null;
Button btn1=null;
Button btn2=null;
Button btn3=null;
Button btn4=null;
Button btn5=null;
Button btn6=null;
Button btn7=null;
Button btn8=null;
Button btn9=null;
Button btnBackspace=null;
Button btnCE=null;
Button btnC=null;
Button btnAdd=null;
Button btnSub=null;
Button btnMul=null;
Button btnDiv=null;
Button btnEqu=null;
TextView tvResult=null;
//声明两个参数。接收tvResult前后的值
double num1=0,num2=0;
double Result=0;//计算结果
int op=0;//判断操作数，
boolean isClickEqu=false;//判断是否按了“=”按钮
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
//从布局文件中获取控件，
btn0=(Button)findViewById(R.id.btn0);
btn1=(Button)findViewById(R.id.btn1);
btn2=(Button)findViewById(R.id.btn2);
btn3=(Button)findViewById(R.id.btn3);
btn4=(Button)findViewById(R.id.btn4);
btn5=(Button)findViewById(R.id.btn5);
btn6=(Button)findViewById(R.id.btn6);
btn7=(Button)findViewById(R.id.btn7);
btn8=(Button)findViewById(R.id.btn8);
btn9=(Button)findViewById(R.id.btn9);
btnBackspace=(Button)findViewById(R.id.btnBackspace);
btnCE=(Button)findViewById(R.id.btnCE);
btnC=(Button)findViewById(R.id.btnC);
btnEqu=(Button)findViewById(R.id.btnEqu);
btnAdd=(Button)findViewById(R.id.btnAdd);
btnSub=(Button)findViewById(R.id.btnSub);
btnMul=(Button)findViewById(R.id.btnMul);
btnDiv=(Button)findViewById(R.id.btnDiv);
tvResult=(TextView)findViewById(R.id.tvResult);
//添加监听\
btnBackspace.setOnClickListener(this);
btnCE.setOnClickListener(this);
btn0.setOnClickListener(this);
btn1.setOnClickListener(this);
btn2.setOnClickListener(this);
btn3.setOnClickListener(this);
btn4.setOnClickListener(this);
btn5.setOnClickListener(this);
btn6.setOnClickListener(this);
btn7.setOnClickListener(this);
btn8.setOnClickListener(this);
btn9.setOnClickListener(this);
btnAdd.setOnClickListener(this);
btnSub.setOnClickListener(this);
btnMul.setOnClickListener(this);
btnDiv.setOnClickListener(this);
btnEqu.setOnClickListener(this);
}
@Override
public void onClick(View v) {
switch (v.getId()) {
//btnBackspace和CE--------------------
case R.id.btnBackspace:
String myStr=tvResult.getText().toString();
try {
tvResult.setText(myStr.substring(0, myStr.length()-1));
} catch (Exception e) {
tvResult.setText("");
}
break;
case R.id.btnCE:
tvResult.setText(null);
break;
//btn0--9---------------------------
case R.id.btn0:
if(isClickEqu)
{
tvResult.setText(null);
isClickEqu=false;
}
String myString=tvResult.getText().toString();
myString+="0";
tvResult.setText(myString);
break;
case R.id.btn1:
if(isClickEqu)
{
tvResult.setText(null);
isClickEqu=false;
}
String myString1=tvResult.getText().toString();
myString1+="1";
tvResult.setText(myString1);
break;
case R.id.btn2:
if(isClickEqu)
{
tvResult.setText(null);
isClickEqu=false;
}
String myString2=tvResult.getText().toString();
myString2+="2";
tvResult.setText(myString2);
break;
case R.id.btn3:
if(isClickEqu)
{
tvResult.setText(null);
isClickEqu=false;
}
String myString3=tvResult.getText().toString();
myString3+="3";
tvResult.setText(myString3);
break;
case R.id.btn4:
if(isClickEqu)
{
tvResult.setText(null);
isClickEqu=false;
}
String myString4=tvResult.getText().toString();
myString4+="4";
tvResult.setText(myString4);
break;
case R.id.btn5:
if(isClickEqu)
{
tvResult.setText(null);
isClickEqu=false;
}
String myString5=tvResult.getText().toString();
myString5+="5";
tvResult.setText(myString5);
break;
case R.id.btn6:
if(isClickEqu)
{
tvResult.setText(null);
isClickEqu=false;
}
String myString6=tvResult.getText().toString();
myString6+="6";
tvResult.setText(myString6);
break;
case R.id.btn7:
if(isClickEqu)
{
tvResult.setText(null);
isClickEqu=false;
}
String myString7=tvResult.getText().toString();
myString7+="7";
tvResult.setText(myString7);
break;
case R.id.btn8:
if(isClickEqu)
{
tvResult.setText(null);
isClickEqu=false;
}
String myString8=tvResult.getText().toString();
myString8+="8";
tvResult.setText(myString8);
break;
case R.id.btn9:
if(isClickEqu)
{
tvResult.setText(null);
isClickEqu=false;
}
String myString9=tvResult.getText().toString();
myString9+="9";
tvResult.setText(myString9);
break;
//btn+-*/=--------------------------------
case R.id.btnAdd:
String myStringAdd=tvResult.getText().toString();
if(myStringAdd.equals(null))
{
return;
}
num1=Double.valueOf(myStringAdd);
tvResult.setText(null);
op=1;
isClickEqu=false;
break;
case R.id.btnSub:
String myStringSub=tvResult.getText().toString();
if(myStringSub.equals(null))
{
return;
}
num1=Double.valueOf(myStringSub);
tvResult.setText(null);
op=2;
isClickEqu=false;
break;
case R.id.btnMul:
String myStringMul=tvResult.getText().toString();
if(myStringMul.equals(null))
{
return;
}
num1=Double.valueOf(myStringMul);
tvResult.setText(null);
op=3;
isClickEqu=false;
break;
case R.id.btnDiv:
String myStringDiv=tvResult.getText().toString();
if(myStringDiv.equals(null))
{
return;
}
num1=Double.valueOf(myStringDiv);
tvResult.setText(null);
op=4;
isClickEqu=false;
break;
case R.id.btnEqu:
String myStringEqu=tvResult.getText().toString();
if(myStringEqu.equals(null))
{
return;
}
num2=Double.valueOf(myStringEqu);
tvResult.setText(null);
switch (op) {
case 0:
Result=num2;
break;
case 1:
Result=num1+num2;
break;
case 2:
Result=num1-num2;
break;
case 3:
Result=num1*num2;
break;
case 4:
Result=num1/num2;
break;
default:
Result=0;
break;
}
tvResult.setText(String.valueOf(Result));
isClickEqu=true;
break;
default:
break;
}
}
}
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