android第四天（单选按钮RadioButton）

总结自：https://study.163.com/course/courseLearn.htm?courseId=207001#/learn/video?lessonId=372070&courseId=207001

1、单选按钮（RadioButton）的基本概念

单选按钮，只能选择一个；

一组单选按钮只能选中一个；

2、RadioGroup与RadioButton

 

3、OnClickListener 与OnCheckedChangeListener监听器

package com.huan.security.securityapp;

import android.provider.Settings;
import android.support.annotation.IdRes;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.CheckBox;
import android.widget.CompoundButton;
import android.widget.RadioButton;
import android.widget.RadioGroup;

public class MainActivity extends AppCompatActivity {

    private RadioGroup radioGroup;
    private RadioButton femaleButton;
    private RadioButton maleButton;
    private CheckBox eatBox;
    private CheckBox sleepBox;
    private CheckBox dotaBox;
    private CheckBox allBox;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.first_layout);
        eatBox=(CheckBox)findViewById(R.id.eatId);
        sleepBox=(CheckBox)findViewById(R.id.sleepId);
        dotaBox=(CheckBox)findViewById(R.id.dotaId);
        allBox=(CheckBox)findViewById(R.id.allbox);
        radioGroup=(RadioGroup)findViewById(R.id.radioGroupId);
        femaleButton=(RadioButton)findViewById(R.id.femaleButtonId);
        maleButton =(RadioButton)findViewById(R.id.maleButtonId);
        RadioGroupListener radioGroupListener=new RadioGroupListener();
        radioGroup.setOnCheckedChangeListener(radioGroupListener);

        RadioButtonListener radioButtonListener=new RadioButtonListener();
        femaleButton.setOnCheckedChangeListener(radioButtonListener);
        CheckBoxListener listener=new CheckBoxListener();
        allBox.setOnCheckedChangeListener(listener);

    }
    class RadioButtonListener implements CompoundButton.OnCheckedChangeListener{

        @Override
        public void onCheckedChanged(CompoundButton compoundButton, boolean b) {
            System.out.println("isChecked--->"+b);
        }
    }
    class RadioGroupListener implements RadioGroup.OnCheckedChangeListener{
        @Override
        public void onCheckedChanged(RadioGroup radioGroup, @IdRes int i) {
            if(i==R.id.femaleButtonId){
                System.out.println("选中了female");
            }
            else if(i==R.id.maleButtonId){
                System.out.println("选中了male");
            }
        }
    }
    class CheckBoxListener implements CompoundButton.OnCheckedChangeListener{
        @Override
        public void onCheckedChanged(CompoundButton compoundButton, boolean b) {//CompoundButton是checkbox的父类，onCheckedChanged为checkbox设计的，当选中与被选中状态改变时，会调用。
                eatBox.setChecked(b);
                sleepBox.setChecked(b);
                dotaBox.setChecked(b);
        }
    }

    class OnBoxClickListener implements View.OnClickListener{
        @Override
        public void onClick(View view) {//就是checkbox对象，是可以向上转型为view
            //view.getId();//控件得ID；
           /*
            System.out.println("id------>"+view.getId());

            if(view.getId()==R.id.eatId){
                System.out.println("eatBox");
            }
            else if (view.getId()==R.id.sleepId){
                System.out.println("sleepId");
            }
            else if (view.getId()==R.id.dotaId){
                System.out.println("doatId");
            }
            */
           CheckBox box=(CheckBox)view;
            if(box.getId()==R.id.eatId){
                System.out.println("eatId");
            }
            else if (box.getId()==R.id.sleepId){
                System.out.println("sleepId");
            }
            else if (box.getId()==R.id.dotaId){
                System.out.println("dotaId");
            }
            if(box.isChecked()){
                System.out.println("checked");
            }
            else{
                System.out.println("unchecked");
            }
            System.out.println("Checkbox is clicked");
        }
    }
}

展示：