Using CompoundButton in Android

The CompoundButton in Android is an abstract class that extends the Button class and implements the Checkable interface. It can be thought of as a button with multiple states, such as Checkbox and Switch.

Common subclasses of CompoundButton include Checkbox, RadioButton, and Switch.

The steps of using CompoundButton are as follows:

1. Define CompoundButton controls in XML layout files, such as Checkbox, RadioButton, or Switch:

<CheckBox
    android:id="@+id/checkbox"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="Checkbox" />

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

<Switch
    android:id="@+id/switch"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content" />

1. In the Java code, locate these CompoundButton widgets and set the necessary listener.

CheckBox checkbox = findViewById(R.id.checkbox);
checkbox.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
    @Override
    public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
        // 处理Checkbox的选中状态改变事件
    }
});

RadioButton radiobutton = findViewById(R.id.radiobutton);
radiobutton.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
    @Override
    public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
        // 处理RadioButton的选中状态改变事件
    }
});

Switch switchButton = findViewById(R.id.switch);
switchButton.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
    @Override
    public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
        // 处理Switch的选中状态改变事件
    }
});

In the callback method of the listener, you can determine the selected state of the CompoundButton based on the isChecked parameter.