我有一个 ListPreference
,看起来像这样:
I have a ListPreference
which look something like this:
<ListPreference
android:title="Choose item"
android:summary="..."
android:key="itemList"
android:defaultValue="item1"
android:entries="@array/items"
android:entryValues="@array/itemValues" />
然后,我有另一个偏好,只有在 ListPreference
中选择了item3"时才应该启用它.
Then, I have another preference which should only be enabled if "item3" is selected in the ListPreference
.
我可以通过 android:dependency
以某种方式完成此任务吗?类似 android:dependency="itemList:item3"
Can I somehow accomplish this with android:dependency
? Something like android:dependency="itemList:item3"
谢谢!
你可以做这样的事情的唯一方法是编程.
The only way you can do something like this is programmaticly.
您必须在 ListPreference 上设置一个更改侦听器,然后启用/禁用另一个.
You'd have to set up an change listener on the ListPreference and then enable/disable the other one.
itemList = (ListPreference)findPreference("itemList");
itemList2 = (ListPreference)findPreference("itemList2");
itemList.setOnPreferenceChangeListener(new
Preference.OnPreferenceChangeListener() {
public boolean onPreferenceChange(Preference preference, Object newValue) {
final String val = newValue.toString();
int index = itemList.findIndexOfValue(val);
if(index==3)
itemList2.setEnabled(true);
else
itemList2.setEnabled(false);
return true;
}
});
如果我是你,如果第一个设置不正确,我什至不会显示第二个偏好.为此,您必须手动声明首选项(而不是在 XML 中)并添加/删除它,而不是启用/禁用.
If I were you I wouldn't even show the second preference if the first isn't set properly. To do that you have to declare the preference manually (not in the XML) and add/remove it instead of enabling/disabling.
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