How do I generate a level randomly?

Question

I am currently hard coding 10 different instances like the code below, but but I'd like to create many more. Instead of having the same layout for the new level, I was wondering if there is anyway to generate a random X value for each block (this will be how far into the level it is). A level 100,000 pixels wide would be good enough but if anyone knows a system to make the level go on and on, I'd like to know that too. This is basically how I define a block now (with irrelevant code removed):

block = new Block(R.drawable.block, 400, platformheight);
block2 = new Block(R.drawable.block, 600, platformheight);
block3 = new Block(R.drawable.block, 750, platformheight);

The 400 is the X position, which I'd like to place randomly through the level, the platformheight variable defines the Y position which I don't want to change.

Answer 1

Considering that each block needs to be further than the previous one,

List<Block> blocks = new LinkedList<Block>();
Random rnd = new Random(System.currentTimeMillis());

int x = 400;

while (youNeedMoreBlocks)
{
    int offset = rnd.nextInt(400) + 100; //500 is the maximum offset, this is a constant
    x += offset;                         //ofset will be between 100 and 400

    blocks.add(new Block(R.drawable.block, x, platformheight));

    //if you have enough blocks, set youNeedMoreBlocks to false
}

But this looks overly simplistic to me. Either i didn't understand your question or it actually was that simple.

Edit:

For assignments like these:

block.setY(three_quarters - 10); 
block2.setY(three_quarters - 10); 
block3.setY(three_quarters - 10);

You need to modify the loop with:

List<Block> blocks = new LinkedList<Block>();
Random rnd = new Random(System.currentTimeMillis());

int x = 400;

while (youNeedMoreBlocks)
{
    int offset = rnd.nextInt(400) + 100; //500 is the maximum offset, this is a constant
    x += offset;                         //ofset will be between 100 and 400

    Block tmp = new Block(R.drawable.block, x, platformheight);
    tmp.setY(three_quarters - 10);                 
            //do with tmp everything you need to apply to each block

    blocks.add(tmp);

    //if you have enough blocks, set youNeedMoreBlocks to false
}

Another wise idea would be to generate the blocks on demand when the player is close to the edge of the map, so you have faster loading times.