求大神帮忙111
和老师视频教学的代码相同，可等号点下去没有反应，其他的都可以。看了一天了，
package com.example.CalculatorDemo;
import android.app.Activity;
import android.content.DialogInterface;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.RadioGroup;
import android.widget.TextView;
public class MyActivity extends Activity implements View.OnClickListener {
/**
* Called when the activity is first created.
*/
private EditText T1;
private Button B0;
private Button B1;
private Button B2;
private Button B3;
private Button B4;
private Button B5;
private Button B6;
private Button B7;
private Button B8;
private Button B9;
private Button point;
private Button del;
private Button clear;
private Button chengfa;
private Button chufa;
private Button jiafa;
private Button jianfa;
private Button denghao;
private boolean clear_flag = true;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
T1 = (EditText) findViewById(R.id.editText);
B0 = (Button) findViewById(R.id.Button0);
B1 = (Button) findViewById(R.id.Button1);
B2 = (Button) findViewById(R.id.Button2);
B3 = (Button) findViewById(R.id.Button3);
B4 = (Button) findViewById(R.id.Button4);
B5 = (Button) findViewById(R.id.Button5);
B6 = (Button) findViewById(R.id.Button6);
B7 = (Button) findViewById(R.id.Button7);
B8 = (Button) findViewById(R.id.Button8);
B9 = (Button) findViewById(R.id.Button9);
point = (Button) findViewById(R.id.buttonpoint);
del = (Button) findViewById(R.id.ButtonDel);
jiafa = (Button) findViewById(R.id.Buttonjiafa);
jianfa = (Button) findViewById(R.id.Buttonjianfa);
chengfa = (Button) findViewById(R.id.Buttonchengfa);
chufa = (Button) findViewById(R.id.Buttonchufa);
clear = (Button) findViewById(R.id.Buttonc);
denghao = (Button) findViewById(R.id.Buttondenghao);
B0.setOnClickListener(this);
B1.setOnClickListener(this);
B2.setOnClickListener(this);
B3.setOnClickListener(this);
B4.setOnClickListener(this);
B5.setOnClickListener(this);
B6.setOnClickListener(this);
B7.setOnClickListener(this);
B8.setOnClickListener(this);
B9.setOnClickListener(this);
point.setOnClickListener(this);
del.setOnClickListener(this);
jianfa.setOnClickListener(this);
jiafa.setOnClickListener(this);
chengfa.setOnClickListener(this);
chufa.setOnClickListener(this);
clear.setOnClickListener(this);
denghao.setOnClickListener(this);
}
@Override
public void onClick(View v) {
String str = T1.getText().toString();
switch (v.getId()) {
case R.id.Button0:
case R.id.Button1:
case R.id.Button2:
case R.id.Button3:
case R.id.Button4:
case R.id.Button5:
case R.id.Button6:
case R.id.Button7:
case R.id.Button8:
case R.id.Button9:
case R.id.buttonpoint:
if(clear_flag){
clear_flag = false;
str = "";
T1.setText("");
}
T1.setText(str + ((Button)v).getText());
break;
case R.id.Buttonc:
T1.setText("");
break;
case R.id.ButtonDel:
if (str!=null&&!str.equals("")) {
T1.setText(str.substring(0, str.length() - 1));
}
break;
case R.id.Buttonchengfa:
case R.id.Buttonchufa:
case R.id.Buttonjiafa:
case R.id.Buttonjianfa:
if(clear_flag){
clear_flag = false;
str = "";
T1.setText("");
}
T1.setText(str + "" + ((Button)v).getText() + "");
break;
case R.id.Buttondenghao:
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 result2 = (int) result;
T1.setText(result2 + "");
}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 result2 = (int) result;
T1.setText(result2 + " ");
}else {
T1.setText(result + " ");
}
}
else{
T1.setText("");
}
}
}跪求大神解答
