6.用户接口UI布局----View控件的概述之RadioButton和CheckBox

1.RadioButton（Button->CompoundButton子类）

<RadioGroup xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical"
android:layout_weight="1">
<RadioButton android:id="@+id/radio_pirates"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="pirates"
android:onClick="onRadioButtonClicked"/>
<RadioButton android:id="@+id/radio_ninjas"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="ninjas"
android:onClick="onRadioButtonClicked"/>
</RadioGroup>

public void onRadioButtonClicked(View view){

Log.i(TAG, "SecondAndroidActivity-->onRadioButtonClicked");
// Is the button now checked?
boolean checked = ((RadioButton) view).isChecked();

// Check which radio button was clicked
switch(view.getId()) {
case R.id.radio_pirates:
if (checked)
// Pirates are the best
break;
case R.id.radio_ninjas:
if (checked)
// Ninjas rule
break;
}
}

// 在右边显示星状button

android:button="@null"

android:drawableRight="@android:drawable/btn_star"

2.CheckBox（[b]Button->CompoundButton子类）[/b]

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<CheckBox android:id="@+id/checkbox_meat"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/meat"
android:onClick="onCheckboxClicked"/>
<CheckBox android:id="@+id/checkbox_cheese"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/cheese"
android:onClick="onCheckboxClicked"/>
</LinearLayout>

public void onCheckboxClicked(View view) {
// Is the view now checked?
boolean checked = (CheckBox) view).isChecked();

// Check which checkbox was clicked
switch(view.getId()) {
case R.id.checkbox_meat:
if (checked)
// Put some meat on the sandwich
else
// Remove the meat
break;
case R.id.checkbox_cheese:
if (checked)
// Cheese me
else
// I'm lactose intolerant
break;
// TODO: Veggie sandwich
}
}