Android scrolling background

OK, here we are.  This is how I implemented the scrolling background in Spy Jumper.  Pretty simple.  Basically it takes images that are width by (width/2).  They are stacked on top of each other.  It basically recycles one of 6 sections (or however many you want to set) to the top of the screen.  Speed can be adjusted for the scrolling and I use a formula to calculate for screen densities. In the below image is 4 different sections of background being called. 0,0,1,2,3,0

 

	public class BackgroundChanger {
	float backY[]={0,height,(height*3),(height*4),(height*5),(height*6)};
	/////////---backY sets the background in this case there are 6 sections. I used width x (width/2)
	int backL[]={1,1,1,1,1,1};
	int speed=5;
	int density=1;
	int heighty=;//////////set as screen height
	static final Bitmap backgroundBitmaps[]={null,null,null};
	//////////---this is used for different backgrounds you can set
	Bitmap backgroundPicker;
	this.height =backgroundBitmaps[0].getHeight();
	backset();
	//////---backset would be called to reset the original setups.
	public void backSet() {
	backY[0]=0;
	backY[1]=height;
	backY[2]=(height*2);
	backY[3]=(height*3);
	backY[4]=(height*4);
	// backY[5]=(height*5);
	}
	backloop(){
	for (int i = 0; i < 5; i++) {
	backY[i]=backY[i]+(speed*density);
	///////recycles background if greater than height
	if(backY[i]>heighty){backY[i]=backY[i]-(height*5);
	Levels.setlevels();
	/////// This actually calls another class that sets the levelPicker. If
	different if changes the background image for the set cell.
	if(levelPicker!=backL[i]){backL[i]=levelPicker;
	}
	}
	switch(backL[i]){
	case 0:backgroundPicker=backgroundBitmaps[i];
	canvas.drawBitmap(backgroundPicker,0,backY[i], null);
	break;
	case 1:backgroundPicker=backgroundBitmaps[i];
	canvas.drawBitmap(backgroundPicker,0,backY[i], null);
	break;
	case 2:backgroundPicker=backgroundBitmaps[i];
	canvas.drawBitmap(backgroundPicker,0,backY[i], null);
	break;
	}
	}
	}
	}

view raw gistfile1.txt hosted with ❤ by GitHub