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.

Answer 1

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) 
{
...
}