下面是一个简单的实现Android俄罗斯方块游戏的示例代码：

首先，创建一个名为TetrisView的自定义View类，用于绘制游戏界面和处理用户输入：

public class TetrisView extends View {

    private static final int ROW_COUNT = 20;
    private static final int COLUMN_COUNT = 10;

    private int[][] grid;
    private Paint paint;
    private Tetromino currentTetromino;
    private Handler handler;

    public TetrisView(Context context, AttributeSet attrs) {
        super(context, attrs);
        init();
    }

    private void init() {
        grid = new int[ROW_COUNT][COLUMN_COUNT];
        paint = new Paint();
        handler = new Handler();
        spawnTetromino();
    }

    private void spawnTetromino() {
        currentTetromino = new Tetromino();
        currentTetromino.setStartPosition(COLUMN_COUNT / 2, 0);
        if (isCollision()) {
            gameOver();
        }
    }

    private boolean isCollision() {
        for (int row = 0; row < Tetromino.SIZE; row++) {
            for (int column = 0; column < Tetromino.SIZE; column++) {
                if (currentTetromino.getShape(row, column) != 0) {
                    int x = currentTetromino.getX() + column;
                    int y = currentTetromino.getY() + row;
                    if (x < 0 || x >= COLUMN_COUNT || y >= ROW_COUNT || grid[y][x] != 0) {
                        return true;
                    }
                }
            }
        }
        return false;
    }

    private void gameOver() {
        // 游戏结束逻辑
    }

    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);

        // 绘制游戏界面

        // 绘制当前方块
        for (int row = 0; row < Tetromino.SIZE; row++) {
            for (int column = 0; column < Tetromino.SIZE; column++) {
                if (currentTetromino.getShape(row, column) != 0) {
                    int x = currentTetromino.getX() + column;
                    int y = currentTetromino.getY() + row;
                    drawCell(canvas, x, y, currentTetromino.getColor());
                }
            }
        }

        // 绘制已经固定的方块
        for (int row = 0; row < ROW_COUNT; row++) {
            for (int column = 0; column < COLUMN_COUNT; column++) {
                if (grid[row][column] != 0) {
                    drawCell(canvas, column, row, grid[row][column]);
                }
            }
        }
    }

    private void drawCell(Canvas canvas, int x, int y, int color) {
        paint.setStyle(Paint.Style.FILL);
        paint.setColor(color);
        canvas.drawRect(x * CELL_SIZE, y * CELL_SIZE, (x + 1) * CELL_SIZE, (y + 1) * CELL_SIZE, paint);

        paint.setStyle(Paint.Style.STROKE);
        paint.setColor(Color.BLACK);
        canvas.drawRect(x * CELL_SIZE, y * CELL_SIZE, (x + 1) * CELL_SIZE, (y + 1) * CELL_SIZE, paint);
    }

    // 处理用户输入事件（如触摸、按键等）

    // 更新游戏逻辑

    // 定时更新方块下落

    // 其他辅助方法
}

接下来，创建一个名为Tetromino的类，用于表示俄罗斯方块的形状和位置：

public class Tetromino {

    public static final int SIZE = 4;

    private int[][] shape;
    private int x;
    private int y;
    private int color;

    public Tetromino() {
        shape = new int[SIZE][SIZE];
        // 初始化方块形状
        // shape[0] = {1, 1, 1, 1}; 横条形状
        // shape[1] = {1, 0, 0, 0};
        // shape[2] = {1, 0, 0, 0};
        // shape[3] = {1, 0, 0, 0};
        // 其他形状类似

        // 随机选择方