How to enable a preference in my android application when other preference is disabled?

问题

I have used PreferenceActivity to have preference in my android application. I want one preference say "pref 2" to be enabled when other preference say "pref 1" is NOT checked and "pref 2" to be disabled when "pref 1" is checked. i.e. exactly opposite of the android:dependancy attribute.

How can I do that?

回答1:

I don't think there's any out-of-the-box solution for it, i.e. an inverted dependancy attribute. But there's always the click-listener:

preference1.setOnPreferenceClickListener(pref1_click);

....

private OnPreferenceClickListener pref1_click = new OnPreferenceClickListener() {
    public boolean onPreferenceClick(Preference preference) {
        preference2.setEnabled(!preference1.isChecked());
        return true;
    }
}

回答2:

Yes it's possible to do this out of the box. Let's say you want to disable pref2 when pref1 is off
Here's the code(preference xml layout) to put in for pref1:

<CheckBoxPreference
    android:title="Pref1"
    android:key="pref1">
</CheckBoxPreference>

Here's the code(preference xml layout) to put in for pref2:

<EditTextPreference
    android:dialogMessage="Pref 2 dialog"
    android:title="Pref2"
    android:key="pref2" 
    android:dependency="pref1">
</EditTextPreference>

Like sigmazero13 said, by default disableDependentsState is false so you don't need to include it in the pref1 attributes.

回答3:

According to the docs here, you can add an attribute to the CheckBoxPreference tag like so:

android:disableDependentsState="true"

By default this is false, which means that the dependents are disabled when the checkbox is unchecked, but by setting it to true, it should have the opposite effect.

回答4:

Android CheckBox??

I am assuming you are using the Android.widget.checkBox:

http://developer.android.com/reference/android/widget/CheckBox.html

Try this

 public class MyActivity extends Activity {
     protected void onCreate(Bundle icicle) {
         super.onCreate(icicle);

         setContentView(R.layout.content_layout_id);

         final CheckBox checkBox1 = (CheckBox) findViewById(R.id.checkbox_id);
         if (checkBox1.isChecked()) {
             checkBox2.setChecked(false);
         }
     }
 }

GoodLUCK!!

来源：https://stackoverflow.com/questions/2672922/how-to-enable-a-preference-in-my-android-application-when-other-preference-is-di

标签

android

android-preferences