How to call getResources from a class which has no context

Question

In my application I have many classes and activities  Droid is a class which does not have context  Mygame is a class which extends SurfaceView and implements SurfaceHolder Callback  I am creating an object of Droid in mygame class and setting the background image and position for it  The code I have written for this is given below   block1   new Droid BitmapFactory decodeResource getResources    R drawable birdpic   100  10     The constructor of Droid class is given below   public Droid Bitmap bitmap  int x  int y         this bitmap   bitmap      this x   x      this y   y         In a particular scenario i have to set the background image and position of the Droid object from the Droid class itself Here i am facing the issue Given below is the code snippet to do this   if checkflag        myObj centerblock new Droid BitmapFactory decodeResource getResources    R drawable blast   myObj xpos  myObj ypos          The problem is that the Droid class has no context  So I cannot use getResources   here  I have tried the code below but it crashes   if checkflag        myObj centerblock new Droid BitmapFactory decodeResource myObj getResources    R drawable blast   myObj xpos  myObj ypos       Can anybody help me  I just want to set the background image and position it for the Droid object from the Droid class itself

User · Accepted Answer

A Context is a handle to the system  it provides services like resolving resources  obtaining access to databases and preferences  and so on  It is an  interface  that allows access to application specific resources and class and information about application environment  Your activities and services also extend Context to they inherit all those methods to access the environment information in which the application is running   This means you must have to pass context to the specific class if you want to get modify some specific information about the resources  You can pass context in the constructor like  public classname Context context  String s1

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   block1   new Droid BitmapFactory decodeResource ctx getResources    R drawable birdpic   100  10      OR  builder setLargeIcon BitmapFactory decodeResource ctx getResources    R drawable birdpic       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

Example  Getting app name string   Resources getSystem   getString  R string app name

User · Answer

It can easily be done if u had declared a class that extends from Application  This class will be like a singleton  so when u need a context u can get it just like this   I think this is the better answer and the cleaner  Here is my code from Utilities package    public static String getAppNAme         return MyOwnApplication getInstance   getString R string app name

User · Answer

The normal solution to this is to pass an instance of the context to the class as you create it  or after it is first created but before you need to use the context   Another solution is to create an Application object with a static method to access the application context although that couples the Droid object fairly tightly into the code   Edit  examples added  Either modify the Droid class to be something like this   public Droid Context context int x  int y        this bitmap   BitmapFactory decodeResource context getResources    R drawable birdpic       this x   x      this y   y             Or create an Application something like this   public class App extends android app Application       private static App mApp   null          non-Javadoc          see android app Application onCreate                Override     public void onCreate                 super onCreate            mApp   this            public static Context context                 return mApp getApplicationContext              And call App context   wherever you need a context - note however that not all functions are available on an application context  some are only available on an activity context but it will certainly do with your need for getResources     Please note that you ll need to add android name to your application definition in your manifest  something like this    lt application     android icon   drawable icon      android label   string app name      android name   App   gt

[android] How to call getResources() from a class which has no context?

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