Android——单选多选按钮的使用详解

一：单选按钮

单选按钮类：RadioButton

android：checked="true"设置默认选中

单选按钮控件通常与RadioGroup搭配使用。 
     RadioGroup是LinearLayout的子类，用于将多个单选按钮组合为一组。 
     同一按钮组内的单选按钮只能有一个被选中。

二：多选按钮

用法基本与Button相同

CheckBox对象.isChecked()方法可以用来判断复选按钮是否选中 

效果图（单选多选写在一个项目里边，用了一个页面跳转）：

项目目录：

多选按钮，两种形式

代码：

activity_main.xml

MainActivity.java

package com.example.radioandcheckdemo;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;

public class MainActivity extends Activity implements OnClickListener{

	private Button button1;
	private Button button2;
	
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        
        button1 = (Button) findViewById(R.id.button1);
        button2 = (Button) findViewById(R.id.button2);
        button1.setOnClickListener(this);
        button2.setOnClickListener(this);
        
    }

	@Override
	public void onClick(View v) {
		Intent intent = new Intent();
		switch (v.getId()) {
		case R.id.button1:
			//跳转页面
			intent.setClass(MainActivity.this, RadioActivity.class);
			startActivity(intent);
			break;
		case R.id.button2:
			//跳转页面
			intent.setClass(MainActivity.this, CheckActivity.class);
			startActivity(intent);
		default:
			break;
		}
	}
}

activity_radio.xml

RadioActivity.java

package com.example.radioandcheckdemo;

import android.app.Activity;
import android.os.Bundle;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.RadioGroup.OnCheckedChangeListener;
import android.widget.Toast;

public class RadioActivity extends Activity implements OnCheckedChangeListener {
	private RadioGroup group1;
	private RadioGroup group2;
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_radio);
		
		group1 = (RadioGroup) findViewById(R.id.group1); 
		group2 = (RadioGroup) findViewById(R.id.group2); 
		group1.setOnCheckedChangeListener(this);
		group2.setOnCheckedChangeListener(this);
	}
	
	@Override
	public void onCheckedChanged(RadioGroup group, int checkedId) {
		//显示值的几种方法
		
		//checkedId选中RadioButton的id
		/*switch (checkedId) {
		case R.id.radio1:
			Toast.makeText(this, "男", Toast.LENGTH_LONG).show();
			break;
		case R.id.radio2:
			Toast.makeText(this, "女", Toast.LENGTH_LONG).show();
			break;
		case R.id.radio3:
			Toast.makeText(this, "吃了", Toast.LENGTH_LONG).show();
			break;
		case R.id.radio4:
			Toast.makeText(this, "没吃", Toast.LENGTH_LONG).show();
			break;

		default:
			break;
		}*/
		
		//找到点击的RadioButton
		//RadioButton radio = (RadioButton) findViewById(checkedId);
		//取出RadioButton中的值
		//String str = radio.getText().toString();
		//弹框显示选中的值
		//Toast.makeText(this, str, Toast.LENGTH_LONG).show();
		
		//两组数据同时显示
		//根据RadioGroup取出数据，没有选中返回-1
		String str = "";
		int buttonId = group1.getCheckedRadioButtonId();
		if(buttonId != -1){
			RadioButton radio = (RadioButton) findViewById(buttonId);
			str = "你的性别是" + radio.getText().toString();			
		}else{
			str = "你没有选择性别";
		}
		buttonId = group2.getCheckedRadioButtonId();
		if(buttonId != -1){
			RadioButton radio = (RadioButton) findViewById(buttonId);
			str += "，   你吃饭了吗？"+radio.getText().toString();
		}
		Toast.makeText(this, str, Toast.LENGTH_LONG).show();
	}
}

activity_check.xml

CheckActivity.java

package com.example.radioandcheckdemo;

import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.CompoundButton;
import android.widget.CompoundButton.OnCheckedChangeListener;
import android.widget.Toast;

public class CheckActivity extends Activity {
	
	private CheckBox check1;
	private CheckBox check2;
	private CheckBox check3;
	private CheckBox check4;
	private Button button1;
	
	private OnCheckedChangeListener listenter = new OnCheckedChangeListener() {
		
		@Override
		public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
			//选中多选框
			CheckBox check = (CheckBox)buttonView;
			//取出当前勾选值
			String str = check.getText().toString();
			//判断是否勾选状态
			if(isChecked){
				str = "你学了"+str;
			}else{
				str = "你没学"+str;
			}
			Toast.makeText(CheckActivity.this, str, Toast.LENGTH_LONG).show();
		}
	};

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_check);
		
		check1 = (CheckBox) findViewById(R.id.check1);
		check2 = (CheckBox) findViewById(R.id.check2);
		check3 = (CheckBox) findViewById(R.id.check3);
		check4 = (CheckBox) findViewById(R.id.check4);
		button1 = (Button) findViewById(R.id.button1);
		
		//多选框点击事件
		/*check1.setOnCheckedChangeListener(listenter);
		check2.setOnCheckedChangeListener(listenter);
		check3.setOnCheckedChangeListener(listenter);
		check4.setOnCheckedChangeListener(listenter);*/
		
		//提交按钮点击事件
		button1.setOnClickListener(new OnClickListener() {
			
			@Override
			public void onClick(View v) {
				String str = "我学过了";
				boolean f = false;
				if(check1.isChecked()){
					str += check1.getText()+",";
					f = true;
				}
				if(check2.isChecked()){
					str += check2.getText()+",";
					f = true;
				}
				if(check3.isChecked()){
					str += check3.getText()+",";
					f = true;
				}
				if(check4.isChecked()){
					str += check4.getText()+",";
					f = true;
				}
				if(f){
					str = str.substring(0, str.length()-1);
				}
				Toast.makeText(CheckActivity.this, str, Toast.LENGTH_LONG).show();
			}
		});
	}
}