Android Calculator - Editview cannot input decimal places

问题

I am new to Android code development...I am developing a Android calculator apps and does not understand why the two EditTexts (first input and second input) cannot accept decimal places but can only input integers...Here attached as follows are the codes:

Thanks!

=============Main Activity===============================

package com.trial.jm4_calculator;

import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.EditText;
import android.widget.RadioButton;
import android.widget.TextView;
import android.support.v4.app.NavUtils;

public class MainActivity extends Activity {

    private TextView output;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

    Button btn1 = (Button) findViewById(R.id.button1);
    btn1.setOnClickListener(btn1Listener);
    output = (TextView) findViewById(R.id.lblOutput);
    }

View.OnClickListener btn1Listener = new View.OnClickListener() {
    public void onClick(View v) {
       double opd1, opd2;
       double result = 0.0;
       EditText txtOpd1, txtOpd2;
       RadioButton rdbAdd, rdbSubtract, rdbMultiply, rdbDivide;
       CheckBox chkDivide;

       txtOpd1 = (EditText) findViewById(R.id.txtOpd1);
       txtOpd2 = (EditText) findViewById(R.id.txtOpd2);

       opd1 = Double.parseDouble(txtOpd1.getText().toString());
       opd2 = Double.parseDouble(txtOpd2.getText().toString());

       rdbAdd = (RadioButton) findViewById(R.id.rdbAdd);
       if (rdbAdd.isChecked()) {
           result = opd1 + opd2;
       }
       rdbSubtract = (RadioButton) findViewById(R.id.rdbSubtract);
       if (rdbSubtract.isChecked()) {
           result = opd1 - opd2;
       }
       rdbMultiply = (RadioButton) findViewById(R.id.rdbMultiply);
       if (rdbMultiply.isChecked()) {
           result = opd1 * opd2;
       }
       rdbDivide = (RadioButton) findViewById(R.id.rdbDivide);
       if (rdbDivide.isChecked()) {

              result = opd1 / opd2;            
       }
       output.setText("Answer = " + result);
    }
};
}

====================Main.xml===================================

<?xml version="1.0" encoding="UTF-8"?>
<LinearLayout 
    android:layout_height="fill_parent" 
    android:layout_width="fill_parent" 
    android:orientation="vertical" 
    xmlns:android="http://schemas.android.com/apk/res/android">
    <LinearLayout 
        android:layout_height="wrap_content" 
        android:layout_width="fill_parent" 
        android:orientation="horizontal"> 
        <TextView 
            android:layout_height="wrap_content" 
            android:layout_width="wrap_content" 
            android:text="First Input: "/> 
        <EditText 
            android:layout_height="wrap_content" 
            android:layout_width="fill_parent" 
            android:inputType="number" 
            android:id="@+id/txtOpd1"/> 
    </LinearLayout>
    <RadioGroup 
        android:layout_height="wrap_content" 
        android:layout_width="fill_parent" 
        android:orientation="horizontal" 
        android:id="@+id/rdgOp"> 
        <RadioButton 
            android:layout_height="wrap_content" 
            android:layout_width="wrap_content" 
            android:text="+ " 
            android:id="@+id/rdbAdd"/> 
        <RadioButton 
            android:layout_height="wrap_content" 
            android:layout_width="wrap_content" 
            android:text="- " 
            android:id="@+id/rdbSubtract"/> 
        <RadioButton 
            android:layout_height="wrap_content" 
            android:layout_width="wrap_content" 
            android:text="* " 
            android:id="@+id/rdbMultiply"/> 
        <RadioButton 
            android:layout_height="wrap_content" 
            android:layout_width="wrap_content" 
            android:text="/ " 
            android:id="@+id/rdbDivide"/> 
    </RadioGroup>
    <LinearLayout 
        android:layout_height="wrap_content" 
        android:layout_width="fill_parent" 
        android:orientation="horizontal"> 
        <TextView 
            android:layout_height="wrap_content" 
            android:layout_width="wrap_content" 
            android:text="Second Input: "/> 
            <EditText 
                android:layout_height="wrap_content" 
                android:layout_width="fill_parent" 
                android:inputType="number" 
                android:id="@+id/txtOpd2"/> 
     </LinearLayout> 
     <Button 
         android:layout_height="wrap_content" 
         android:layout_width="wrap_content" 
         android:text="Compute" 
         android:id="@+id/button1"/> 
     <TextView 
         android:layout_height="wrap_content" 
         android:layout_width="wrap_content" 
         android:id="@+id/lblOutput"/> 
</LinearLayout>

回答1:

If you want to use Decimal Number only on your EditText

use the xml attribute android:inputType="numberDecimal" in your EditText widget your EditText declaration will be like this:

<EditText
    android:id="@+id/editText1"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:ems="10"
    android:inputType="numberDecimal" />

If you want to use Signed Decimal Number than combine the two Xml attributes android:inputType="numberDecimal" and android:inputType="numberSigned". Your EditText declaration will be like this:

<EditText
    android:id="@+id/editText1"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:ems="10"
    android:inputType="numberDecimal|numberSigned" >

</EditText>

回答2:

Change android:inputType from "number" to "numberDecimal". See the documentation for even more options for inputType.

回答3:

inputType="number" doesnt allow floats. try changing:

android:inputType="number"

to:

android:numeric="integer|decimal"

回答4:

You need to change the input type of your EditText in the XML code.

Change the inputType attribute of the EditText from

android:inputType="number"

to

android:inputType="numberDecimal"

<EditText 
            android:layout_height="wrap_content" 
            android:layout_width="fill_parent" 
            android:inputType="numberDecimal" 
            android:id="@+id/txtOpd1"/>

来源：https://stackoverflow.com/questions/12021068/android-calculator-editview-cannot-input-decimal-places