为什么我点等于没反应啊
package com.example.jisuanqi;
import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
public class MainActivity extends Activity implements OnClickListener{
Button btn_0;//0数字按钮
Button btn_1;//1数字按钮
Button btn_2;//2数字按钮
Button btn_3;//3数字按钮
Button btn_4;//4数字按钮
Button btn_5;//5数字按钮
Button btn_6;//6数字按钮
Button btn_7;//7数字按钮
Button btn_8;//8数字按钮
Button btn_9;//9数字按钮
Button btn_point;//小数点按钮
Button btn_clear;//清除按钮
Button btn_del;//删除按钮
Button btn_plus;//加号按钮
Button btn_minus;//减号按钮
Button btn_multiply;//乘号按钮
Button btn_divide;//除号按钮
Button btn_equal;//等号按钮
EditText et_input;//显示输入内容的显示屏
boolean clear_flag;//清空标识
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
btn_0 = (Button) findViewById(R.id.btn_0);
btn_1 = (Button) findViewById(R.id.btn_1);
btn_2 = (Button) findViewById(R.id.btn_2);
btn_3 = (Button) findViewById(R.id.btn_3);
btn_4 = (Button) findViewById(R.id.btn_4);
btn_5 = (Button) findViewById(R.id.btn_5);
btn_6 = (Button) findViewById(R.id.btn_6);
btn_7 = (Button) findViewById(R.id.btn_7);
btn_8 = (Button) findViewById(R.id.btn_8);
btn_9 = (Button) findViewById(R.id.btn_9);
btn_point = (Button) findViewById(R.id.btn_point);
btn_clear = (Button) findViewById(R.id.btn_clear);
btn_del = (Button) findViewById(R.id.btn_del);
btn_plus = (Button) findViewById(R.id.btn_plus);
btn_minus = (Button) findViewById(R.id.btn_minus);
btn_multiply = (Button) findViewById(R.id.btn_multiply);
btn_divide = (Button) findViewById(R.id.btn_divide);
btn_equal = (Button) findViewById(R.id.btn_equal);
//实例化按钮
et_input = (EditText) findViewById(R.id.et_input);//实例化显示屏
btn_0.setOnClickListener(this);
btn_1.setOnClickListener(this);
btn_2.setOnClickListener(this);
btn_3.setOnClickListener(this);
btn_4.setOnClickListener(this);
btn_5.setOnClickListener(this);
btn_6.setOnClickListener(this);
btn_7.setOnClickListener(this);
btn_8.setOnClickListener(this);
btn_9.setOnClickListener(this);
btn_point.setOnClickListener(this);
btn_clear.setOnClickListener(this);
btn_del.setOnClickListener(this);
btn_plus.setOnClickListener(this);
btn_minus.setOnClickListener(this);
btn_multiply.setOnClickListener(this);
btn_divide.setOnClickListener(this);
btn_equal.setOnClickListener(this);
//设置按钮点击事件
}
@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;
}
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
String str = et_input.getText().toString();
switch(v.getId())
{
case R.id.btn_0:
case R.id.btn_1:
case R.id.btn_2:
case R.id.btn_3:
case R.id.btn_4:
case R.id.btn_5:
case R.id.btn_6:
case R.id.btn_7:
case R.id.btn_8:
case R.id.btn_9:
case R.id.btn_point:
if(clear_flag){
clear_flag=false;
str = "";
et_input.setText("");
}
et_input.setText(str+((Button)v).getText());
break;
case R.id.btn_plus:
case R.id.btn_minus:
case R.id.btn_multiply:
case R.id.btn_divide:
if(clear_flag){
clear_flag=false;
str = "";
et_input.setText("");
}
et_input.setText(str+" "+((Button)v).getText());
break;
case R.id.btn_del:
if(clear_flag){
clear_flag=false;
str = "";
et_input.setText("");
}else if(str!=null&&!str.equals("")){
et_input.setText(str.substring(0,str.length()-1));
}
break;
case R.id.btn_clear:
clear_flag=false;
str = "";
et_input.setText("");
break;
case R.id.btn_equal:
getResult();
break;
}
}
/*
* 运算结果
* */
private void getResult(){
String exp = et_input.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(" "));//运算符前面的字符串
String op = exp.substring(exp.indexOf(" ")+1,exp.indexOf(" ")+2);
String s2 = exp.substring(exp.indexOf(" ")+3);//运算符后面的字符串
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;
et_input.setText(r+"");
}else{
et_input.setText(result+"");
}
}else if(!s1.equals("")&&s2.equals("")){
et_input.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;
et_input.setText(r+"");
}else{
et_input.setText(result+"");
}
}else{
et_input.setText("");
}
}
}
