Android基础控件RadioButton的基本使用

1、先上图

2、基础知识
2.1、RadioButton一般需要配合RadioGroup使用,否则Radio之间不能互斥;
2.2、RadioButton的事件一般绑定在RadioGroup接口中:RadioGroup.OnCheckedChangeListener,实现方法onCheckedChanged(RadioGroup group, @IdRes int checkedId);
2.3、RadioGroup通过getCheckedRadioButtonId()方法可获取当前被选中RadioButton的ID;

3、Demo说明
3.1、当选中RadioGroup中的某个RadioButton时,通过Log类将其id与文本输出;
3.2、当点击提交按钮时,修改TextView中的文字,与RadioButton中相关的文字关联起来;

4、关键代码
Activity

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package com.yusian.demo;
 
import android.support.annotation.IdRes;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.text.Editable;
import android.text.TextWatcher;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.TextView;
 
import org.w3c.dom.Text;
 
public class MainActivity extends AppCompatActivity {
 
    private  RadioGroup radioGroup;
 
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
 
        final RadioGroup radioGroup = (RadioGroup)findViewById(R.id.radioGroup);
        radioGroup.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(RadioGroup group, @IdRes int checkedId) {
                RadioButton radio = (RadioButton) findViewById(checkedId);
                Log.i("SALog", "id:"+checkedId+"-->"+radio.getText());
            }
        });
 
        Button button = (Button)findViewById(R.id.button);
        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                int id = radioGroup.getCheckedRadioButtonId();
                if (id <= 0) return;
                RadioButton radio = (RadioButton)findViewById(id);
                TextView textView = (TextView)findViewById(R.id.textView);
                textView.setText("充值金额:"+radio.getText());
            }
        });
    }
}

XML

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<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    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"
    android:orientation="vertical"
    tools:context="com.yusian.demo.MainActivity">
    <TextView
        android:id="@+id/textView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textSize="20sp"
        android:text="充值金额"/>
 
    <RadioGroup
        android:id="@+id/radioGroup"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="horizontal">
 
        <RadioButton
            android:id="@+id/radio1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="50"/>
        <RadioButton
            android:id="@+id/radio2"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="100"/>
        <RadioButton
            android:id="@+id/radio3"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="200"/>
 
    </RadioGroup>
 
    <Button
        android:id="@+id/button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="提交"/>
</LinearLayout>

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