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                                            changliu

让Fragmentation 继续走下去

使用androidx包出这个问题，v7包没问题 ` java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.mall/com.example.mall.MainActivity}: java.lang.ClassCastException: com.example.mall.MainActivity cannot be cast to me.yokeyword.fragmentation.SupportActivity`