How to make Draw on a Canvas in Android. If you want to create Draw on a Canvas function check below example. In the below example I have created a Suraface class. Canvas works like as an interface. I have also used onDraw() method for drawing event.

Step(1)-MainActivity -

public class MainActivity extends Activity {

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    Suraface v = new Suraface(this);
    setContentView(v);

}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    getMenuInflater().inflate(R.menu.main, menu);
    return true;
}
}

Step(2)Suraface class-

public class Suraface extends SurfaceView implements
        SurfaceHolder.Callback {
    Bitmap mBitmap;

    public SurafaceClass(Context context) {
        super(context);
        mBitmap = BitmapFactory.decodeResource(getResources(),
                R.drawable.ic_launcher);
        }

    @Override
    public void surfaceChanged(SurfaceHolder holder, int format, int width,
            int height) {

    }

    @Override
    public void surfaceCreated(SurfaceHolder holder) {

    }

    @Override
    public void surfaceDestroyed(SurfaceHolder holder) {

    }

    @Override
    protected void onDraw(Canvas canvas) {
        canvas.drawColor(Color.BLACK);
    }

}