范围里循环有关问题

范围里循环问题
范围里循环

[功能]
比如：有一些图片资源列表 如下：

int[] resource = {R.drawable.beijing_001_mb5ucom,R.drawable.beijing_002_mb5ucom,R.drawable.beijing_003_mb5ucom,R.drawable.beijing_004_mb5ucom};

//负取 后退private int fitPrevious(int i){    int cycle = i;        if(cycle <= 0){    cycle = cycle + resource.length;    }    cycle = cycle - 1;    return cycle;       }    //正取 前进private int fitNext(int i){    int cycle = i + 1;        if(cycle > resource.length - 1){    cycle = cycle - resource.length;    }        return cycle;}

id = fitPrevious(id );

id = fitNext(id);