常见控件（RadioButton、CheckBox、Toast）

1. RadioGroup和RadioButton

2.CheckBox

3.Toast(吐司)

---

RadioButton怎么玩

将多个RadioButton定义在一个RadioGroup里面，同一个组中的单选按钮只能选中一个。如:男，女

<RadioGroup
android:id="@+id/radioGroup"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical">
    <RadioButton
android:id="@+id/male"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/male"/>
    <RadioButton
android:id="@+id/female"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/female"/>
</RadioGroup>

接下来在.java里面设置监听器,设置的监听器是给RadioGroup的

onCheckedChangeListener()

//设置监听器
radioGroup.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(RadioGroup group, int checkedId) {
if (checkedId == R.id.male){
            Toast.makeText(MainActivity.this,"选中了男",Toast.LENGTH_SHORT).show();
        }else if (checkedId ==R.id.female){
            Toast.makeText(MainActivity.this,"选中了女",Toast.LENGTH_SHORT).show();
        }
    }
});

---

CheckBox

多项选择：吃饭、睡觉、打豆豆

CheckBox和RadioGroup不同，他要为每个选项分别设置监听器

注：由于CheckBox是CompoundButton的子类，所以可以new一个CompoundButton类型（向上转型）的

监听器，而RadioGroup不是这个的子类，所以，RadioGroup定义内部类实现相同名字的监听器以适应自己的需求。

//分别设置CheckBox的监听器
checkBoxEat.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
if (isChecked){
            Toast.makeText(MainActivity.this,"真贪吃",Toast.LENGTH_SHORT).show();
        }else {
            Toast.makeText(MainActivity.this,"不贪吃",Toast.LENGTH_SHORT).show();
        }
    }
});
checkBoxSleep.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
if (isChecked){
            Toast.makeText(MainActivity.this,"真贪睡",Toast.LENGTH_SHORT).show();
        }else {
            Toast.makeText(MainActivity.this,"不贪睡",Toast.LENGTH_SHORT).show();
        }
    }
});
checkBoxPlay.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
if (isChecked){
            Toast.makeText(MainActivity.this,"真贪玩",Toast.LENGTH_SHORT).show();
        }else {
            Toast.makeText(MainActivity.this,"不贪玩",Toast.LENGTH_SHORT).show();
        }
    }
});