Multi layer parallax live wallpaper

I'm just starting android programming, and I'm trying to make a live wallpaper with multiple images and a parallax effect. I load the bitmaps at startup.

This is my code for offset changed:

    @Override
    public void onOffsetsChanged(float xOffset, float yOffset,
    float xStep, float yStep, int xPixels, int yPixels) 
    {
    this.mmPixel= (float) (xPixels * 0.8);
    this.mmPixel1= (float) (xPixels * 1);
    this.mmPixel2 = (float) (xPixels * 1.2);
    this.mmPixel3 = (float) (xPixels * 1.5);
    drawFrame();
    }

and this is my code for the drawFrame:

    void drawFrame()
    {   
        if(!mVisible) return;
        final SurfaceHolder holder = getSurfaceHolder();
        Canvas c = null;
        try
        {
            c = holder.lockCanvas();
            if(c != null)
            {
                c.drawBitmap(background, mmPixel, 0, paint);
                c.drawBitmap(layer1, mmPixel1, 0 , paint);
                c.drawBitmap(layer2, mmPixel1, 0, paint);    
                c.drawBitmap(layer3, mmPixel2, 0, paint);
            }
        }finally
        {
            if(c != null) holder.unlockCanvasAndPost(c);
        }

        mHandler.removeCallbacks(mDrawScene);
        if(mVisible)
        {
            mHandler.postDelayed(mDrawScene, 1000/30);
        }
    }

The problem that I'm running into is that I encounter serious lag with even 720p images. This is a problem when the phone I'm testing on has a 720p screen, and I want to develop for full HD screens and beyond. Is there any way to make this run faster or more efficiently?