java– 什么是notifyItemRangeChanged(0,this.data.size());在这个例子中,它是如何工作的？

概述我理解ViewHolder的onBindViewHolder如何工作,但是我不清楚notifyItemRangeChanged(0,this.data.size())如何;适用于此示例以及它的确切功能.提供给此适配器的数据采用Json格式.适配器如下：publicclassAdapterQuestionextendsRecyclerView.Adapter<AdapterQuestion.ViewQue

我理解VIEwHolder的onBindVIEwHolder如何工作,但是我不清楚notifyItemRangeChanged(0,this.data.size())如何;适用于此示例以及它的确切功能.

提供给此适配器的数据采用Json格式.

适配器如下：

 public class AdapterQuestion extends RecyclerVIEw.Adapter<AdapterQuestion.VIEwQuestion>{     private LayoutInflater mLayoutInflater;     //this is an arrayList of questionData objects     private ArrayList<QuestionData> data =new ArrayList<>();     //Created the layoutInflator     public AdapterQuestion(Context context){          //get from context          mLayoutInflater=LayoutInflater.from(context);     }     public voID setBlogList(ArrayList<QuestionData> data){         this.data =data;         notifyItemRangeChanged(0, this.data.size());     }     @OverrIDe     public VIEwQuestion onCreateVIEwHolder(VIEwGroup parent, int vIEwType) {         //inflates the customQuestion vIEw or converts it to java code         VIEw vIEw= mLayoutInflater.inflate(R.layout.customquestion, null);        //We Now want to convert the VIEw into a VIEwQuestion, vIEw Question takes        //a vIEw so we pass the vIEw into vIEw question and then return it.        VIEwQuestion holder=new VIEwQuestion(vIEw);        return holder;    }    //VIEwGroup parent and VIEwType are not being assigned.    @OverrIDe    public voID onBindVIEwHolder(VIEwQuestion holder, int position) {         //here we need to bind the data to our vIEw, there is currently no Data!         //We need to get the data from our JsON         //Parameters is a VIEwHolder and a position         //This gives us the current information object from the whole arrayList         //data.get(position) data is the arrayList and we are getting the current position or index;         //That current obj is of Type QuestionData         QuestionData currentObj= data.get(position);         //we are accessing the Inflated vIEw, or saved vIEw with holder         //holder.answerText is the textVIEw in holder. We are then taking that current object         //We are getting the text of the current object and setting it to the AnswerText vIEw         holder.answerText.setText(currentObj.getMtext());         holder.answerID.setText(currentObj.getID());         holder.mVotes.setText(currentObj.getVotes());         holder.mlikebutton.setTag(currentObj);     }    @OverrIDe    public int getItemCount() {         return data.size();    }    public class VIEwQuestion extends RecyclerVIEw.VIEwHolder{        //once we create it once the reclycer vIEw will automatically recycle it        private TextVIEw answerText;        private TextVIEw answerID;        private TextVIEw mVotes;        private likebutton mlikebutton;        public VIEwQuestion (VIEw itemVIEw){            super(itemVIEw);            //here we are finding the vIEws by their ID            answerText=(TextVIEw)itemVIEw.findVIEwByID(R.ID.answerText);            answerID=(TextVIEw)itemVIEw.findVIEwByID(R.ID.answerID);            mVotes=(TextVIEw)itemVIEw.findVIEwByID(R.ID.VoteTextVIEw);            mlikebutton=    (likebutton)itemVIEw.findVIEwByID(R.ID.heart_buttons);            mlikebutton.setonlikeListener(new OnlikeListener() {                @OverrIDe                public voID liked(likebutton likebutton) {                    Voting Vote = new Voting();                    Vote.onUpVote(convertToString(),                             getAdapterposition(),VIEwQuestion.this);                    System.out.print("Adapter position"+getAdapterposition());                }                @OverrIDe                public voID unliked(likebutton likebutton) {                     Voting onDown=new Voting();                     onDown.onDownVote(convertToString(),                              getAdapterposition(), VIEwQuestion.this);                }            });        }        public String getVoteVIEw(){            String VoteVIEw=mVotes.getText().toString();            return VoteVIEw;        }        public String convertToString(){            String converted=answerID.getText().toString();            return converted;        }        public int convertToInt(){            String converted=answerID.getText().toString();            int ConvertedInt=Integer.parseInt(converted);            return ConvertedInt;        }    }}

解决方法:

当要在RecyclerVIEw中设置的数据发生更改时,适配器需要收到有关数据更改的通知,以便它可以更改recyclervIEw中的数据.

方法

notifyItemRangedChanged(fromIndex,toIndex);

用于通知适配器在整个数据中更改了一组数据,它告诉适配器适配器应刷新数据并将其重新加载到从传入方法的fromIndex到toIndex的recyclerVIEw中.

如果您有多个数据已更改但不是全部,则使用此方法,这些已更改的数据也在群集中,以便您可以说从第5到第10个索引数据已更改.

如果更改了所有数据,请致电：

notifyDataSetChanged();

如果只更改了一个dataItem,则调用：

notifyItemChanged(dataposition);

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