部分代码：
public void onClick(View v) {
// TODO Auto-generated method stub
String str=t1.getText().toString();
switch(v.getId()){
case R.id.button16:
case R.id.button13:
case R.id.button14:
case R.id.button15:
case R.id.button9:
case R.id.button10:
case R.id.button11:
case R.id.button5:
case R.id.button6:
case R.id.button7:
case R.id.button17:
if(clear_flag){
clear_flag=false;
str="";
t1.setText("");
}
t1.setText(str+((Button)v).getText());
break;
case R.id.button12:
case R.id.button8:
case R.id.button4:
case R.id.button3:
if(clear_flag){
clear_flag=false;
str="";
t1.setText("");
}
t1.setText(str+" "+((Button)v).getText()+" ");
break;
case R.id.button2:
if(clear_flag){
clear_flag=false;
str="";
t1.setText("");
}
else if(str!=null&&!str.equals("")){
t1.setText(str.substring(0,str.length()-1));
}
break;
case R.id.button1:
clear_flag=false;
str="";
t1.setText(" ");
break;
case R.id.button18:
getResult();
break;
}
}
private void getResult(){
String exp=t1.getText().toString();
if(exp==null||exp.equals(" ")){
return;
}
if(!exp.contains(" ")){
return;
}
if(clear_flag){
clear_flag=false;
return;
}
clear_flag=true;
double result=0;
String s1=exp.substring(0,exp.indexOf(""));
String op=exp.substring(exp.indexOf("")+1,exp.indexOf("")+2);
String s2=exp.substring(exp.indexOf("")+3);
if(!s1.equals("")&&!s2.equals("")){
double d1=Double.parseDouble(s1);
double d2=Double.parseDouble(s2);
if(op.equals("+")){
result=d1+d2;
}else if(op.equals("-")){
result=d1-d2;
}else if(op.equals("*")){
result=d1*d2;
}else if(op.equals("/")){
if(d2==0){
result=0;}else{
result=d1/d2;
}
}
if(!s1.contains(".")&&!s2.contains(".")&&!op.equals('/')){
int r=(int)result;
t1.setText(r+"");
}else{
t1.setText(result+"");}
}else if(!s1.equals("")&&s2.equals("")){
t1.setText(exp);
}else if(s1.equals("")&&!s2.equals("")){
double d2=Double.parseDouble(s2);
if(op.equals("+")){
result=0+d2;
}else if(op.equals("-")){
result=0-d2;
}else if(op.equals("*")){
result=0;
}else if(op.equals("/")){
result=0;
}
if(!s2.contains(".")){
int r=(int)result;
t1.setText(r+" ");
}else{
t1.setText(result+" ");
}
}else{
t1.setText("");
}
} |
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