day04：RadioButton单选按钮

string.xml：

<?xml version="1.0" encoding="utf-8"?>
<resources>

    <string name="app_name">RadioButton</string>
    <string name="action_settings">Settings</string>
    <string name="hello_world">Hello world!</string>
    
    <string name="amount">充值金额：</string>

</resources>

 radio_button_demo.xml：

<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"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".MainActivity" >

    <RadioGroup
        android:id="@+id/radioGroup1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:layout_marginTop="44dp" >

        <RadioButton
            android:id="@+id/radio0"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:checked="true"
            android:text="50" />

        <RadioButton
            android:id="@+id/radio1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="100" />

        <RadioButton
            android:id="@+id/radio2"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="200" />
    </RadioGroup>

    <TextView
        android:id="@+id/tvAmount"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@+id/radioGroup1"
        android:text="@string/amount"
        android:textSize="20sp" />

</RelativeLayout>

 RadioButtonDemo.java：

package com.lvshitech.radiobutton;

import android.app.Activity;
import android.os.Bundle;
import android.widget.RadioGroup;
import android.widget.TextView;

public class RadioButtonDemo extends Activity {
	
	TextView tvAmount;
	RadioGroup rg;
	String temp = "充值金额：";
	String amount50 = "50 元";
	String amount100 = "100 元";
	String amount200 = "200 元";
	
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		
		setContentView(R.layout.radio_button_demo);
		
		tvAmount = (TextView) findViewById(R.id.tvAmount);
		tvAmount.setText(temp + amount50);
		
		rg = (RadioGroup) findViewById(R.id.radioGroup1);
		
		rg.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
			@Override
			public void onCheckedChanged(RadioGroup radioGroup, int checkedId) {
				String result = "";
				switch(checkedId) {
					case R.id.radio0:
						result = amount50;
						break;
					case R.id.radio1:
						result = amount100;
						break;
					case R.id.radio2:
						result = amount200;
						break;
				}
				tvAmount.setText(temp + result);
			}
		});
	}
}

==================================== 下面是通过按钮来触发 ====================================

string.xml：

<?xml version="1.0" encoding="utf-8"?>
<resources>

    <string name="app_name">RadioButton</string>
    <string name="action_settings">Settings</string>
    <string name="hello_world">Hello world!</string>
    
    <string name="amount">充值金额：</string>
    <string name="btnSubmit">提交</string>

</resources>

 RadioButtonDemo.java：

package com.lvshitech.radiobutton;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.RadioGroup;
import android.widget.TextView;

public class RadioButtonDemo extends Activity {
	
	TextView tvAmount;
	RadioGroup rg;
	Button btnSub;
	String temp = "充值金额：";
	String amount50 = "50 元";
	String amount100 = "100 元";
	String amount200 = "200 元";
	
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		
		setContentView(R.layout.radio_button_demo);
		
		tvAmount = (TextView) findViewById(R.id.tvAmount);
		tvAmount.setText(temp + amount50);
		btnSub = (Button) findViewById(R.id.btnSub);
		rg = (RadioGroup) findViewById(R.id.radioGroup1);
		
		btnSub.setOnClickListener(new View.OnClickListener() {
			@Override
			public void onClick(View view) {
				String result = "";
				int isCheckedId = rg.getCheckedRadioButtonId();		// 获取被选中的单选按钮的Id
				switch(isCheckedId) {
					case R.id.radio0:
						result = amount50;
						break;
					case R.id.radio1:
						result = amount100;
						break;
					case R.id.radio2:
						result = amount200;
						break;	
				}
				tvAmount.setText(temp + result);
			}
		});
		
		/*rg.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
			@Override
			public void onCheckedChanged(RadioGroup radioGroup, int checkedId) {
				String result = "";
				switch(checkedId) {
					case R.id.radio0:
						result = amount50;
						break;
					case R.id.radio1:
						result = amount100;
						break;
					case R.id.radio2:
						result = amount200;
						break;
				}
				tvAmount.setText(temp + result);
			}
		});*/
	}
}