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+package com.andyiac.rxdb;%0A%0Aimport android.content.Context;%0A%0Apublic class RxDB %7B%0A%0A    private RxDB() %7B%0A%0A    %7D%0A%0A    private RxDB mInstance;%0A%0A    private RxDB getInstance(Context context) %7B%0A%0A        if (mInstance == null) %7B%0A            mInstance = new RxDB();%0A        %7D%0A%0A        return mInstance;%0A    %7D%0A%0A%0A%7D%0A

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