Android首选项onclick事件

Question

在我的preferences.xml中,我有一个像这样的首选元素:

<Preference android:title="About" />

我想分配onClick事件,所以如果用户点击它,我就可以打开新的Intent或浏览器.我试着像按钮那样做,但这似乎不起作用.

Answer 1

巴德尔

你需要设置android:key项目,然后在你的代码中你可以做...

假设您在XML中使用以下内容:

<Preference android:title="About" android:key="myKey"></Preference>

然后,您可以在代码中执行以下操作:

Preference myPref = (Preference) findPreference("myKey");
myPref.setOnPreferenceClickListener(new OnPreferenceClickListener() {
             public boolean onPreferenceClick(Preference preference) {
                 //open browser or intent here
                 return true;
             }
         });

Answer 2

推出网站:

<PreferenceScreen android:title="website">
    <intent
        android:action="android.intent.action.VIEW"
        android:data="http://www.example.com"
        />
</PreferenceScreen>

发起特定活动:

<PreferenceScreen android:title="something">
    <intent
        android:action="android.intent.action.MAIN"
        android:targetPackage="com.example.foo"
        android:targetClass="com.example.foo.SomeActivity"
        />
</PreferenceScreen>

你也可以使用"android:mimetype"来设置mimetype.

Answer 3

您需要使用onPreferenceTreeClick事件.

例如,请参阅http://www.javased.com/index.php?source_dir=platform_packages_apps_phone/src/com/android/phone/MobileNetworkSettings.java

 @Override 
    public boolean onPreferenceTreeClick(PreferenceScreen preferenceScreen, Preference preference) { 
        /** TODO: Refactor and get rid of the if's using subclasses */ 
        if (mGsmUmtsOptions != null && 
                mGsmUmtsOptions.preferenceTreeClick(preference) == true) { 
            return true; 
        } else if (mCdmaOptions != null && 
                   mCdmaOptions.preferenceTreeClick(preference) == true) { 
            if (Boolean.parseBoolean( 
                    SystemProperties.get(TelephonyProperties.PROPERTY_INECM_MODE))) { 

                mClickedPreference = preference; 

                // In ECM mode launch ECM app dialog 
                startActivityForResult( 
                    new Intent(TelephonyIntents.ACTION_SHOW_NOTICE_ECM_BLOCK_OTHERS, null), 
                    REQUEST_CODE_EXIT_ECM); 
            } 
            return true; 
        } else if (preference == mButtonPreferredNetworkMode) { 
            //displays the value taken from the Settings.System 
            int settingsNetworkMode = android.provider.Settings.Secure.getInt(mPhone.getContext(). 
                    getContentResolver(), android.provider.Settings.Secure.PREFERRED_NETWORK_MODE, 
                    preferredNetworkMode); 
            mButtonPreferredNetworkMode.setValue(Integer.toString(settingsNetworkMode)); 
            return true; 
        } else if (preference == mButtonDataRoam) { 
            if (DBG) log("onPreferenceTreeClick: preference == mButtonDataRoam."); 

            //normally called on the toggle click 
            if (mButtonDataRoam.isChecked()) { 
                // First confirm with a warning dialog about charges 
                mOkClicked = false; 
                new AlertDialog.Builder(this).setMessage( 
                        getResources().getString(R.string.roaming_warning)) 
                        .setTitle(android.R.string.dialog_alert_title) 
                        .setIconAttribute(android.R.attr.alertDialogIcon) 
                        .setPositiveButton(android.R.string.yes, this) 
                        .setNegativeButton(android.R.string.no, this) 
                        .show() 
                        .setOnDismissListener(this); 
            } else { 
                mPhone.setDataRoamingEnabled(false); 
            } 
            return true; 
        } else if (preference == mButtonDataEnabled) { 
            if (DBG) log("onPreferenceTreeClick: preference == mButtonDataEnabled."); 
            ConnectivityManager cm = 
                    (ConnectivityManager)getSystemService(Context.CONNECTIVITY_SERVICE); 

            cm.setMobileDataEnabled(mButtonDataEnabled.isChecked()); 
            return true; 
        } else if (preference == mLteDataServicePref) { 
            String tmpl = android.provider.Settings.Secure.getString(getContentResolver(), 
                        android.provider.Settings.Secure.SETUP_PREPAID_DATA_SERVICE_URL); 
            if (!TextUtils.isEmpty(tmpl)) { 
                TelephonyManager tm = (TelephonyManager) getSystemService( 
                        Context.TELEPHONY_SERVICE); 
                String imsi = tm.getSubscriberId(); 
                if (imsi == null) { 
                    imsi = ""; 
                } 
                final String url = TextUtils.isEmpty(tmpl) ? null 
                        : TextUtils.expandTemplate(tmpl, imsi).toString(); 
                Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse(url)); 
                startActivity(intent); 
            } else { 
                android.util.Log.e(LOG_TAG, "Missing SETUP_PREPAID_DATA_SERVICE_URL"); 
            } 
            return true; 
        } else { 
            // if the button is anything but the simple toggle preference, 
            // we'll need to disable all preferences to reject all click 
            // events until the sub-activity's UI comes up. 
            preferenceScreen.setEnabled(false); 
            // Let the intents be launched by the Preference manager 
            return false; 
        } 
    } 

Answer 4

2018+ 更新 今天，该findPreference方法已被弃用。因此，要实现这一点，只需覆盖onPreferenceTreeClickPreference 片段中的方法即可。例如：

public class MySettingsFragment extends PreferenceFragment {

    @Override
    public boolean onPreferenceTreeClick (PreferenceScreen preferenceScreen,
                                          Preference preference)
    {
        String key = preference.getKey();
        if(key.equals("someKey")){
            // do your work
            return true;
        }
        return false;
    }
}

此外，如果您需要处理特定首选项元素（例如ListPreference）内的点击，您应该setOnPreferenceChangeListener在 的onCreate方法内注册MySettingsFragment：

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    // Load the preferences from an XML resource
    addPreferencesFromResource(R.xml.preferences);

    // register listener
    final Preference prefList = findPreference("key");
    prefList.setOnPreferenceChangeListener(new Preference.OnPreferenceChangeListener() {
        public boolean onPreferenceChange(Preference preference, Object value) {
            System.out.println("Selected: " + value);
            return true;
        }
    });
}