setOnCheckedChangeListener(new OnCheckedChangeListener() {
@Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
// How to check whether the checkbox/switch has been checked
// by user or it has been checked programatically ?
if (isNotSetByUser())
return;
handleSetbyUser();
}
});
如何实现方法isNotSetByUser()？
答复2:
一个非常简单的答案:
在OnClickListener上使用，而不是OnCheckedChangeListener
someCheckBox.setOnClickListener(new OnClickListener(){
@Override
public void onClick(View v) {
// you might keep a reference to the CheckBox to avoid this class cast
boolean checked = ((CheckBox)v).isChecked();
setSomeBoolean(checked);
}
});
现在，您只需要 Select 点击事件，而不必担心编程更改.
答复1:
我创建了一个包装器类(参见Decorator模式)，它以封装的方式处理这个问题:
public class BetterCheckBox extends CheckBox {
private CompoundButton.OnCheckedChangeListener myListener = null;
private CheckBox myCheckBox;
public BetterCheckBox(Context context) {
super(context);
}
public BetterCheckBox(Context context, CheckBox checkBox) {
this(context);
this.myCheckBox = checkBox;
}
// assorted constructors here...
@Override
public void setOnCheckedChangeListener(
CompoundButton.OnCheckedChangeListener listener){
if(listener != null) {
this.myListener = listener;
}
myCheckBox.setOnCheckedChangeListener(listener);
}
public void silentlySetChecked(boolean checked){
toggleListener(false);
myCheckBox.setChecked(checked);
toggleListener(true);
}
private void toggleListener(boolean on){
if(on) {
this.setOnCheckedChangeListener(myListener);
}
else {
this.setOnCheckedChangeListener(null);
}
}
}
复选框仍然可以在XML中声明为相同，但在代码中初始化GUI时使用此选项:
BetterCheckBox myCheckBox;
// later...
myCheckBox = new BetterCheckBox(context,
(CheckBox) view.findViewById(R.id.my_check_box));
如果要在不触发侦听器的情况下设置从代码选中，请呼叫myCheckBox.silentlySetChecked(someBoolean)而不是setChecked.