判斷用戶是否第一次安裝APP

public  boolean isFirstStart(Context context) {
    SharedPreferences preferences = context.getSharedPreferences(
            "SHARE_APP_TAG", 0);
    Boolean isFirst = preferences.getBoolean("FIRSTStart", true);
    if (isFirst) {// 第一次
        preferences.edit().putBoolean("FIRSTStart", false).commit();

        Log.e("GFA","一次");
        return true;
    } else {
        Log.e("GFA","N次");
        return false;
    }