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这是我的代码,我的建议很清楚,但它不起作用。有什么问题?

    String sp = "R.drawable.i" + gid;
    int path = Integer.valueOf(sp);

    switch (gid) {
    case 1:
        Layout.setBackgroundResource(path);
        break;
    case 2:
        Layout.setBackgroundResource(path);
    default:
        break;
    }
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