设置监听的最基本方式

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public class FloatingActionButton extends FrameLayout implements Checkable {

public static interface OnCheckedChangeListener {
void onCheckedChanged(FloatingActionButton fabView, boolean isChecked);
}

private OnCheckedChangeListener mOnCheckedChangeListener;

public void setOnCheckedChangeListener(OnCheckedChangeListener listener) {
mOnCheckedChangeListener = listener;
}