处理没有魔术字符串的Android首选项

您可以将“魔术字符串”移动到字符串资源： @H_772_2@在你偏好xml文件中：

<EditTextPreference
        android:key="@String/preferences_pdn_key"
        android@R_723_6964@="@String/preferences_pdn_title"
        android:sumMary="@String/preferences_pdn_sumMary"
        android:dialogmessage="@String/input_pdn_message" />

@H_772_2@在values / Strings.xml文件中：

...
<String name="preferences_pdn_key">pdn</String>
...

@H_772_2@然后,您可以从您的活动或偏好活动中引用偏好：

SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(this);
String pdnKey = getString(R.String.prefernece_pdn_key);
String pdn = sharedPreferences.getString(pdnKey,null);

@H_772_2@如果你不喜欢从字符串资源中获取首选项,那么你可以再做一个技巧：

public class Preferencenames {

    /* categories */ 
    public static final String LoginCategory = MyApplication.getresourceString(R.String.preferences_login_category_key);
    ...

    /* preferences */   
    public static final String Pdn = MyApplication.getresourceString(R.String.preferences_pdn_key);
    ...
}

@H_772_2@所以你现在可以用下面的方式引用你的偏好键：

SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(this);
String pdn = sharedPreferences.getString(Preferencenames.Pdn,null);

@H_772_2@这里是您的MyApplication类应如下所示：

public class MyApplication extends Application {    
    private static VvmApplication s_instance;

    public MyApplication(){
        s_instance = this;
    }

    public static Context getContext(){
        return s_instance;
    }

    public static String getresourceString(int resId){
        return getContext().getString(resId);       
    }
}

@H_772_2@另外你需要添加下一件事你的AndroidManifest.xml：

<application android:name="com.mypackage.application.MyApplication" ... >
...
</application>