public class MyView extends View {

    Paint paint = new Paint();
    Shader shader;
    Matrix mat = new Matrix();
    Bitmap bitmap;

    public MyView(Context context) {
        this(context, null);
    }

    public MyView(Context context, @Nullable AttributeSet attrs) {
        this(context, attrs, 0);
    }

    public MyView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);

        // create a bitmap from the image resource what we want to draw
        bitmap = BitmapFactory.decodeResource(getResources(), R.drawable.dossier_icon);
        // a bitmap shader, would be set into paint, here we use repeat tile mode, but since we'll
        // scale to make the bitmap fill the canvas just right, so there would be no repeat.
        shader = new BitmapShader(bitmap, Shader.TileMode.REPEAT, Shader.TileMode.REPEAT);
        // after this, the paint would contains this bitmap.
        paint.setShader(shader);
    }

    @Override
    protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
        super.onLayout(changed, left, top, right, bottom);
        // scale to make bitmap fill the canvas
        mat.setScale((float)getWidth() / bitmap.getWidth(), (float)getHeight() / bitmap.getHeight());
        shader.setLocalMatrix(mat);
    }

    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);
        // draw a circle with the paint.
        canvas.drawCircle(getWidth() / 2, getHeight() / 2, getWidth() / 2, paint);
    }
}

android.view.WindowManager$BadTokenException: Unable to add window -- token android.os.BinderProxy@e2815e is not valid; is your activity running?
        at android.view.ViewRootImpl.setView(ViewRootImpl.java:679)
        at android.view.WindowManagerGlobal.addView(WindowManagerGlobal.java:342)
        at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:93)
        at android.widget.Toast$TN.handleShow(Toast.java:459)
        at android.widget.Toast$TN$2.handleMessage(Toast.java:342)
        at android.os.Handler.dispatchMessage(Handler.java:102)
        at android.os.Looper.loop(Looper.java:154)
        at android.app.ActivityThread.main(ActivityThread.java:6119)
        at java.lang.reflect.Method.invoke(Native Method)