安卓如何通过java将RadioButton添加到RadioGroup？

Question

It maybe a very simple question but i am beginner in Android please help with it.

我已经在XML中创建了两个RadioButton而没有RadioGroup，并且在MainActivity.java中创建了一个RadioGroup，如何在该RadioGroup中添加这两个RadioButton？代码如下

主要活动。xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:安卓="http://schemas.安卓.com/apk/res/安卓"
    xmlns:tools="http://schemas.安卓.com/tools"
    安卓:layout_width="match_parent"
    安卓:layout_height="match_parent"
    tools:context="com.avisingh.radiobuttontest.MainActivity">

<RadioButton
    安卓:id="@+id/male_button"
    安卓:layout_width="wrap_content"
    安卓:layout_height="wrap_content"
    安卓:layout_marginTop="10dp"
    安卓:text="Male"/>

<RadioButton
    安卓:id="@+id/female_button"
    安卓:layout_width="wrap_content"
    安卓:layout_height="wrap_content"
    安卓:layout_marginTop="50dp"
    安卓:text="Female"/>

</RelativeLayout>

主要活动。java

package com.avisingh.radiobuttontest;

import 安卓.support.v7.app.AppCompatActivity;
import 安卓.os.Bundle;
import 安卓.view.View;
import 安卓.widget.RadioButton;
import 安卓.widget.RadioGroup;
import 安卓.widget.Toast;

public class MainActivity extends AppCompatActivity {

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    final RadioButton maleBtn = (RadioButton)findViewById(R.id.male_button);
    final RadioButton femaleBtn = (RadioButton)findViewById(R.id.female_button);
    RadioGroup radioGroup = new RadioGroup(this);

    //radioGroup.add(maleBtn); // its getting error
    //radioGroup.add(femaleBtn); // its getting error
    //radioGroup.addView(maleBtn); // it is also getting error
    //radioGroup.addView(femaleBtn); // it is also getting error

    }
}

有没有什么方法可以像java一样同时添加RadioButton

Answer 1

以下是你可以做到的

RadioButton radioButton = new RadioButton(this);
    radioButton.setText("Test Radio");
    radioButton.setId(1);
    radioGrp.addView(radioButton);

如果太多，试着把它放入循环

 for (int i = 0; i < radioItems.length; i++) {
        RadioButton radioButton = new RadioButton(this);
        radioButton.setText(radioItems[i]);
        radioButton.setId(i);
        radioGrp.addView(radioButton);
    }

Answer 2

您可以在“activity_main”中添加“RadioGroup”。xml'

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.avisingh.radiobuttontest.MainActivity">
<RadioGroup
    android:id="@+id/radioSex"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content" >
<RadioButton
    android:id="@+id/male_button"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginTop="10dp"
    android:text="Male"/>

<RadioButton
    android:id="@+id/female_button"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginTop="50dp"
    android:text="Female"/>
</RadioGroup>