简化管理SharedPreferences的代码

Question

怎么样能缩减一下这些代码？

  prefsDisplay = getSharedPreferences("spinnerSelection",
            Context.MODE_PRIVATE);
    prefsPlan = getSharedPreferences("spinnerSelection1",
            Context.MODE_PRIVATE);

    if (prefsDisplay.getInt("spinnerSelection", 0) == 0) {
        s1 = 0;
    } else if (prefsDisplay.getInt("spinnerSelection", 0) == 1) {
        s1 = 1;
    } else if (prefsDisplay.getInt("spinnerSelection", 0) == 2) {
        s1 = 2;
    } else if (prefsDisplay.getInt("spinnerSelection", 0) == 3) {
        s1 = 3;
    } else {
        s1 = 0;
        DP.BreakdownMonths = 0;
    }

    if (prefsPlan.getInt("spinnerSelection1", 0) == 0) {
        s2 = 0;
    } else if (prefsPlan.getInt("spinnerSelection1", 0) == 1) {
        s2 = 1;
    } else if (prefsPlan.getInt("spinnerSelection1", 0) == 2) {
        s2 = 2;
    } else {
        s2 = 0;
        DP.PlanType = "highint";
    }

代码的功能是，当应用程序登入，检测SharedPreferences，如果检测到值，就分配，不然就用默认值

Answer 1

s1 = prefsDisplay.getInt("spinnerSelection", -1 );
if( s1 != 0 && s1 != 1 && s1 != 2 && s1 != 3) { 
    s1 = 0;
    DP.BreakdownMonths = 0;
}

这样应该和最初的代码意思一致。