android - checkboxpreference android中的多个依赖项

Question

我的首选项屏幕中有三个复选框。我想让用户一次只选择一个复选框。我如何实现这一目标？

先感谢您。

Answer 1

您需要创建一个 onpreferenceChangelistener：

prefChangeListener = new Preference.OnPreferenceChangeListener() {

                @Override
                public boolean onPreferenceChange(Preference preference, Object newValue) {
                    if (preference == pref1 && newValue.toString().equals("true")){
                        pref2.setChecked(false);
                        pref3.setChecked(false);
                    }
                    if (preference == pref2 && newValue.toString().equals("true")){
                        pref1.setChecked(false);
                        pref3.setChecked(false);
                    }
                    if (preference == pref3 && newValue.toString().equals("true")){
                        pref1.setChecked(false);
                        pref2.setChecked(false);
                    }
                    return true;    
                }
        };

然后使用它，

pref1.setOnPreferenceChangeListener(prefChangeListener);
pref2.setOnPreferenceChangeListener(prefChangeListener);
pref3.setOnPreferenceChangeListener(prefChangeListener);

或者，您可以使用 ListPreference 来弹出一个单选组，然后您可以将三个选项放在那里。这就是我在我的应用程序中所做的，但如果需要复选框首选项，那么这当然会起作用。

这是我的列表偏好（用于选择响铃的时间）：

<ListPreference android:persistent="true"
            android:title="Ring Time"
            android:summary="Choose how long the phone will ring when activated"
            android:key="ringTime"
            android:defaultValue="ringNot"
            android:entries="@array/ringTime"
            android:entryValues="@array/ringSetting" />

这是我的 @array/ringTime 和 @array/ringSetting 的 XML

 <?xml version="1.0" encoding="utf-8"?>
<resources>
<string-array name="ringTime">
   <item>Don\'t Ring</item>
   <item>Ring 30 Seconds</item>
   <item>Ring 2 Minutes</item>   
   <item>Ring 5 Minutes</item>
</string-array>
<string-array name="ringSetting">
   <item>ringNot</item>
   <item>ring30Sec</item>
   <item>ring2Min</item>   
   <item>ring5Min</item>
</string-array>

</resources>

我知道这是一个 5 个月大的问题，截至今天，但我认为这可能对其他人有所帮助。:)

然后在我的代码中实现 listpreference：

ringTime = pref.getString("ringTime", "ringNot");//ListPreferences are stored as strings
if (ringTime.equals(ring30Sec))
//ring for 30 seconds
else if (ringTime.equals(ring2Min))
//ring for 2 minutes
else if (ringTime.equals(ring5Min))
//ring for 5 minutes
else Toast.makeText(getBaseContext(), "Not Ringing", Toast.LENGTH_LONG).show(); 

Answer 2

这称为单选按钮。别客气

Answer 3

也许使用广播组？:) http://developer.android.com/resources/tutorials/views/hello-formstuff.html#RadioButtons

或者，如果您确实需要使用复选框小部件，您可以使用 isChecked() 检查其他复选框，然后在 OnCheckedChangeListener 类实现中通过 setChecked(false) 取消勾选

Answer 4

@SuppressWarnings("deprecation")
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    addPreferencesFromResource(R.xml.settings);
    //mSharedPrefs = PreferenceManager.getDefaultSharedPreferences(this);
    mLocationChangedListener = new OnPreferenceChangeListener() {

        @Override
        public boolean onPreferenceChange(Preference preference,
                Object newValue) {
            mChbLocationLastChanged = (CheckBoxPreference) preference;
            return true;
        }

    };
    mLocationClickListener = new Preference.OnPreferenceClickListener() {

        @Override
        public boolean onPreferenceClick(Preference preference) {
            setLocationAccuracy();
            return true;
        }
    };
    mChbLocationHigh = (CheckBoxPreference) findPreference("pref_chb_location_high_accuracy_key");
    mChbLocationHigh.setOnPreferenceChangeListener(mLocationChangedListener);
    mChbLocationHigh.setOnPreferenceClickListener(mLocationClickListener);
    mChbLocationBalanced = (CheckBoxPreference) findPreference("pref_chb_location_balanced_power_key");
    mChbLocationBalanced.setOnPreferenceChangeListener(mLocationChangedListener);
    mChbLocationBalanced
            .setOnPreferenceClickListener(mLocationClickListener);
    mChbLocationLowPower = (CheckBoxPreference) findPreference("pref_chb_location_low_power_key");
    mChbLocationLowPower.setOnPreferenceChangeListener(mLocationChangedListener);
    mChbLocationLowPower
            .setOnPreferenceClickListener(mLocationClickListener);
    mChbLocationNoPower = (CheckBoxPreference) findPreference("pref_chb_location_no_power_key");
    mChbLocationNoPower.setOnPreferenceChangeListener(mLocationChangedListener);
    mChbLocationNoPower
            .setOnPreferenceClickListener(mLocationClickListener);
}

private void setLocationAccuracy() {
    boolean isChecked = mChbLocationLastChanged.isChecked();
    String key = mChbLocationLastChanged.getKey();
    if (key.equalsIgnoreCase("pref_chb_location_high_accuracy_key")) {
        mChbLocationBalanced.setChecked(false);
        mChbLocationLowPower.setChecked(false);
        mChbLocationNoPower.setChecked(false);
    } else if (key.equalsIgnoreCase("pref_chb_location_balanced_power_key")) {
        mChbLocationHigh.setChecked(false);
        mChbLocationLowPower.setChecked(false);
        mChbLocationNoPower.setChecked(false);
    } else if (key.equalsIgnoreCase("pref_chb_location_low_power_key")) {
        mChbLocationHigh.setChecked(false);
        mChbLocationBalanced.setChecked(false);
        mChbLocationNoPower.setChecked(false);
    } else if (key.equalsIgnoreCase("pref_chb_location_no_power_key")) {
        mChbLocationHigh.setChecked(false);
        mChbLocationBalanced.setChecked(false);
        mChbLocationLowPower.setChecked(false);
    }
    if (!mChbLocationLastChanged.isChecked())
        mChbLocationLastChanged.setChecked(true);
}