int android.support.v7.widget.RecyclerView$ViewHolder.mItemViewType' on a null.....

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Android.support.v7.widget.RecyclerView$ViewHolder.mItemViewType‘ on a null..null 指標問題,費勁心思才找到報null 指標的原因:

代碼是這樣的,有多種布局類型

 

@Override    public int getItemViewType(int position) {        BmobIMMessage message = msgs.get(position);        if(message.getMsgType().equals(BmobIMMessageType.IMAGE.getType())){            return message.getFromId().equals(currentUid) ? TYPE_SEND_IMAGE: TYPE_RECEIVER_IMAGE;        }else if(message.getMsgType().equals(BmobIMMessageType.LOCATION.getType())){            return message.getFromId().equals(currentUid) ? TYPE_SEND_LOCATION: TYPE_RECEIVER_LOCATION;        }else if(message.getMsgType().equals(BmobIMMessageType.VOICE.getType())){            return message.getFromId().equals(currentUid) ? TYPE_SEND_VOICE: TYPE_RECEIVER_VOICE;        }else if(message.getMsgType().equals(BmobIMMessageType.TEXT.getType())){            return message.getFromId().equals(currentUid) ? TYPE_SEND_TXT: TYPE_RECEIVER_TXT;        }else if(message.getMsgType().equals(BmobIMMessageType.VIDEO.getType())){            return message.getFromId().equals(currentUid) ? TYPE_SEND_VIDEO: TYPE_RECEIVER_VIDEO;        }else if(message.getMsgType().equals("agree")) {//顯示歡迎            return TYPE_AGREE;        }else{//            return -1;            return  TYPE_AGREE;        }

然後這是

getItemCount()
@Overridepublic int getItemCount() {    return msgs.size();}

最後發現是因為itemCount與viewType不匹配導致的

例如:

recyclerview總共有6種類型,現在唯寫了一種類型測試,其他的都沒有些,才導致報空,然後在getItemCount中return 1;  就ok了

 

int android.support.v7.widget.RecyclerView$ViewHolder.mItemViewType' on a null.....

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