Using getResources in non-activity class

Question

I am trying to use getResources method in a non-activity class  How do I get the reference to the  resources  object so that I can access the xml file stored under resources folder   Example   XmlPullParser xpp   getResources   getXml R xml samplexml

User · Answer

this can be done by using  context getResources   getXml R xml samplexml

User · Answer

well no need of passing the context and doing all that   simply do this   Context context   parent getContext      Edit   where parent is the ViewGroup

User · Answer

in your MainActivity    public class MainActivity extends AppCompatActivity        Override     protected void onCreate Bundle savedInstanceState            super onCreate savedInstanceState           setContentView R layout activity main           if ResourcesHelper resources    null                ResourcesHelper resources   getResources                        ResourcesHelper    public class ResourcesHelper       public static Resources resources      then use it everywhere  String s   ResourcesHelper resources getString R string app name

User · Answer

here is my answer   public class WigetControl   private Resources res   public WigetControl Resources res         this res   res     public void setButtonDisable Button mButton        mButton setBackgroundColor res getColor R color loginbutton unclickable        mButton setEnabled false          and the call can be like this           WigetControl control   new WigetControl getResources             control setButtonDisable btNext

User · Answer

Its not a good idea to pass Context objects around  This often will lead to memory leaks  My suggestion is that you don t do it  I have made numerous Android apps without having to pass context to non-activity classes in the app  A better idea would be to get the resources you need access to while your in the Activity or Fragment  and hold onto it in another class  You can then use that class in any other classes in your app to access the resources  without having to pass around Context objects

User · Answer

This always works for me   import android app Activity  import android content Context   public class yourClass     Context ctx    public yourClass  Handler handler  Context context     super handler       ctx   context         Use context  ctx  in your code like this   XmlPullParser xpp   ctx getResources   getXml R xml samplexml      OR  final Intent intent   new Intent ctx  MainActivity class      OR  NotificationManager notificationManager    NotificationManager  ctx getSystemService Context NOTIFICATION SERVICE      ETC         Not related to this question but example using a Fragment to access system resources activity like this   public boolean onQueryTextChange String newText     Activity activity   getActivity     Context context   activity getApplicationContext     returnSomething newText    return false     View customerInfo   getActivity   getLayoutInflater   inflate R layout main layout items  itemsLayout  false    itemsLayout addView customerInfo

User · Answer

In simple class declare context and get data from file from res folder  public class FileData         private Context context           public FileData Context current               this context   current                    void  getData                     InputStream in   context getResources   openRawResource R raw file11           BufferedReader reader   new BufferedReader new InputStreamReader in              write stuff to get Data                In the activity class declare like this  public class MainActivity extends AppCompatActivity     protected void onCreate Bundle savedInstanceState            super onCreate savedInstanceState            setContentView R layout activity main           FileData fileData new FileData this

User · Answer

We can use context Like this try now Where the parent is the ViewGroup   Context context   parent getContext

User · Answer

There is one more way without creating a object also  Check the reference  Thanks for  cristian  Below I add the steps which mentioned in the above reference  For me I don t like to create a object for that and access  So I tried to access the getResources   without creating a object  I found this post  So I thought to add it as a answer   Follow the steps to access getResources   in a non activity class without passing a context through the object    Create a subclass of Application  for instance public class App extends Application    Refer the code next to the steps  Set the android name attribute of your  lt application gt  tag in the AndroidManifest xml to point to your new class  e g  android name   App  In the onCreate   method of your app instance  save your context  e g  this  to a static field named app and create a static method that returns this field  e g  getContext    Now you can use  App getContext   whenever you want to get a context  and then we can use App getContext   getResources   to get values from the resources    This is how it should look   public class App extends Application       private static Context mContext        Override     public void onCreate             super onCreate            mContext   this             public static Context getContext            return mContext

User · Answer

You will have to pass a context object to it  Either this if you have a reference to the class in an activty  or getApplicationContext    public class MyActivity extends Activity       public void onCreate Bundle savedInstanceState            RegularClass regularClass   new RegularClass this             Then you can use it in the constructor  or set it to an instance variable    public class RegularClass        private Context context       public RegularClass Context current           this context   current             public findResource            context getResources   getXml R xml samplexml             Where the constructor accepts Context as a parameter

User · Answer

I am late but complete solution   Example Class  Use Context like this  -  public class SingletonSampleClass           Your cute context     private Context context      private static SingletonSampleClass instance        Pass as Constructor     private SingletonSampleClass Context context            this context   context             public synchronized static SingletonSampleClass getInstance Context context            if  instance    null  instance   new SingletonSampleClass context           return instance           At end  don t forgot to relase memory     public void onDestroy            if context    null              context   null                      Warning  Memory Leaks    How to solve this    Option 1  Instead of passing activity context i e  this to the singleton class  you can pass applicationContext     Option 2  If you really have to use activity context  then when the activity is destroyed  ensure that the context you passed to the singleton class is set to null   Hope it helps

User · Answer

In the tour guide app of Udacity s Basic ANdroid course I have used the concept of Fragments  I got stuck for a while experiencing difficulty to access some string resources described in strings  xml file  Finally got a solution   This is the main activity class  package com example android tourguidekolkata   import android os Bundle  import android support design widget TabLayout  import android support v4 view ViewPager  import android support v7 app AppCompatActivity   public class MainActivity extends AppCompatActivity     Override protected void onCreate Bundle savedInstanceState        lines of code      lines of code       lines of code     YourClass adapter   new YourClass getSupportFragmentManager    getApplicationContext            lines of code        getApplicationContext   method passses the Context of main activity to the class TourFragmentPageAdapter        This is the non Activity class that extends FragmentPageAdapter  public class YourClass extends FragmentPagerAdapter   private String yourStringArray     new String 4   Context context   public YourClass  FragmentManager fm  Context context        super fm       this context   context     store the context of main activity        now you can use this context to access any resource      yourStringArray 0    context getResources   getString R string tab1       yourStringArray 1    context getResources   getString R string tab2       yourStringArray 2    context getResources   getString R string tab3       yourStringArray 3    context getResources   getString R string tab4      Override public Fragment getItem int position         Override public int getCount     return 4      Override public CharSequence getPageTitle int position       Generate title based on item position return yourStringArras position

[android] Using getResources() in non-activity class

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