点等号就清空了，其他正常
package com.abc.calculator;
import android.support.v7.app.ActionBarActivity;
import android.support.v4.app.Fragment;
import android.content.DialogInterface;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.EditText;
public class MainActivity extends ActionBarActivity implements OnClickListener{
Button btn_0;
Button btn_1;
Button btn_2;
Button btn_3;
Button btn_4;
Button btn_5;
Button btn_6;
Button btn_7;
Button btn_8;
Button btn_9;
Button btn_point;
Button btn_clear;
Button btn_del;
Button btn_plus;
Button btn_minus;
Button btn_multiply;
Button btn_divide;
Button btn_equal;
EditText et_input;
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
if (savedInstanceState == null) {
getSupportFragmentManager().beginTransaction()
.add(R.id.container, new PlaceholderFragment())
.commit();
};
}
@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 boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
/**
* A placeholder fragment containing a simple view.
*/
public static class PlaceholderFragment extends Fragment {
public PlaceholderFragment() {
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_main, container, false);
return rootView;
}
}
public void onClick(View arg0) {
// TODO Auto-generated method stub
String str=et_input.getText().toString();
switch(arg0.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)arg0).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)arg0).getText()+" ");
break;
case R.id.btn_clear:
clear_flag=false;
str="";
et_input.setText("");
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_equal:
getResult();
break;
}
}
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
String op=exp.substring(exp.indexOf(" ")+1,exp.indexOf(" ")+2);//运算符
String s2=exp.substring(exp.indexOf(" ")+3);//运算符后面
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(".")){
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 if(!s1.equals("")&&s2.equals("")){
}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("");
}
}
}
