android-我的Recyclerview没有显示任何内容

概述我想显示从mysql数据库到我的recyclerview的项目,但我不知道为什么它不显示任何内容Recyclerview<LinearLayoutxmlns:android="http://schemas.android.com/apkes/android"xmlns:tools="http://schemas.android.comools"android:id="@+id/activity_likely_problems&qu

我想显示从mysql数据库到我的recyclervIEw的项目,但我不知道为什么它不显示任何内容

RecyclervIEw

<linearLayout xmlns:androID="http://schemas.androID.com/apk/res/androID"xmlns:tools="http://schemas.androID.com/tools"androID:ID="@+ID/activity_likely_problems"androID:layout_wIDth="match_parent"androID:layout_height="match_parent"androID:paddingBottom="@dimen/zerodimen"androID:paddingleft="@dimen/zerodimen"androID:paddingRight="@dimen/zerodimen"androID:paddingtop="@dimen/zerodimen"androID:background="@color/colorBackground"androID:orIEntation="vertical"tools:context="com.example.system2.tranxav.likelyProblemsActivity"><androID.support.v7.Widget.Toolbar    androID:layout_wIDth="match_parent"    androID:layout_height="wrap_content"    androID:ID="@+ID/toolbar"    androID:background="@color/background" /><androID.support.v4.Widget.SwipeRefreshLayout    androID:layout_wIDth="match_parent"    androID:layout_height="wrap_content"    androID:ID="@+ID/likelyProblemSwipetoRefresh">     </androID.support.v4.Widget.SwipeRefreshLayout><androID.support.v7.Widget.RecyclerVIEw    androID:layout_below="@ID/toolbar"    androID:ID="@+ID/likelyProblemRecyclerVIEw"    androID:layout_wIDth="match_parent"    androID:layout_height="wrap_content" /></linearLayout>

RecyclervIEw内容

<linearLayoutandroID:layout_wIDth="match_parent"androID:layout_height="wrap_content"androID:ID="@+ID/how_layout"androID:orIEntation="vertical"xmlns:androID="http://schemas.androID.com/apk/res/androID"><androID.support.v7.Widget.CardVIEw    androID:layout_margin="8dp"    androID:layout_wIDth="match_parent"    androID:layout_height="wrap_content">    <TextVIEw        androID:text="welcome"        androID:padding="8dp"        androID:ID="@+ID/likelyProblem"        androID:layout_wIDth="match_parent"        androID:layout_height="wrap_content" /></androID.support.v7.Widget.CardVIEw> </linearLayout>

RecyclerAdapter

public class likelyProblemAdapter extends   RecyclerVIEw.Adapter<likelyProblemAdapter.likelyProblemVIEwHolder> {private List<likelyProblems> mlikeyProblems;Context context;RecyclerVIEwClickListener mListener;public interface  RecyclerVIEwClickListener{    voID onClick(VIEw vIEw, int position);}public likelyProblemAdapter(List<likelyProblems> mlikeyProblems, Context context) {    this.mlikeyProblems = mlikeyProblems;    this.context = context;}@NonNull@OverrIDepublic likelyProblemVIEwHolder onCreateVIEwHolder(@NonNull VIEwGroup parent, int vIEwType) {    LayoutInflater inflater = LayoutInflater.from(context);    VIEw  vIEw = inflater.inflate(R.layout.activity_likely_problem_recyclervIEw_item, null, false);    likelyProblemVIEwHolder vIEwHolder = new likelyProblemVIEwHolder(vIEw);    return vIEwHolder;}@OverrIDepublic voID onBindVIEwHolder(@NonNull likelyProblemVIEwHolder holder, int position) {    likelyProblems likelyProblems = mlikeyProblems.get(position);    holder.likelyProblem.setText(likelyProblems.getProblems());}@OverrIDepublic int getItemCount() {    return mlikeyProblems.size();}class likelyProblemVIEwHolder extends RecyclerVIEw.VIEwHolder {    TextVIEw likelyProblem;    Context mCxt;    public likelyProblemVIEwHolder(VIEw itemVIEw) {        super(itemVIEw);        this.mCxt = mCxt;        likelyProblem = itemVIEw.findVIEwByID(R.ID.likelyProblem);    }  } }

主要活动

private List<likelyProblems> mlikelyProblems;private String liKELY_PROBLEM_URL = MYURL.url + "vehicle-problems";  @OverrIDeprotected voID onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentVIEw(R.layout.activity_first_problem);    mRecyclerVIEw = (RecyclerVIEw) findVIEwByID(R.ID.likelyProblemRecyclerVIEw); // Instantiate RecyclervIEw    mlikelyProblems = new ArrayList<>(); // Create a new array List    linearlayoutmanager linearlayoutmanager = new linearlayoutmanager(this);    mRecyclerVIEw.setLayoutManager(linearlayoutmanager);    mRecyclerVIEw.setHasFixedSize(true);    likelyProblemAdapter = new likelyProblemAdapter(mlikelyProblems, this);    likelyProblemAdapter.notifyDataSetChanged();    RequestQueue requestQueue = Volley.newRequestQueue(getApplicationContext());    StringRequest stringRequest = new StringRequest(Request.Method.GET, liKELY_PROBLEM_URL, new com.androID.volley.Response.Listener<String>() {        @OverrIDe        public voID onResponse(String response) {            Log.i("info", response);            try {                JsONArray JsonArray = new JsONArray(response);                for (int i=0; i<=JsonArray.length()-1; i++){                    JsONObject likelyProblemJson = JsonArray.getJsONObject(i);                    likelyProblem = likelyProblemJson.getString("problems");                    likelyProblems likelyProblems = new likelyProblems(likelyProblem);                    mlikelyProblems.add(likelyProblems);                    mRecyclerVIEw.setAdapter(likelyProblemAdapter);                }            } catch (JsONException e) {                e.printstacktrace();            }        }    }, new com.androID.volley.Response.ErrorListener() {        @OverrIDe        public voID one rrorResponse(VolleyError error) {            error.printstacktrace();        }    });    int socketTimeout = 30000;    RetryPolicy retryPolicy = new DefaultRetryPolicy(socketTimeout, DefaultRetryPolicy.DEFAulT_MAX_RETRIES, DefaultRetryPolicy.DEFAulT_BACKOFF_MulT);    stringRequest.setRetryPolicy(retryPolicy);    requestQueue.add(stringRequest); }}

我在控制台上收到Json响应,但是它在recyclervIEw上没有显示,我不知道可能是问题的原因.

解决方法:

Issue no 1 :- set adapter outsIDe the loop

Issue no 2 :- you forgot to notify your likelyProblemAdapter after adding new data in your mlikelyProblems

Issue no 3 :- layout

尝试这个

  for (int i=0; i<=JsonArray.length()-1; i++){                        JsONObject likelyProblemJson = JsonArray.getJsONObject(i);                        likelyProblem = likelyProblemJson.getString("problems");                        likelyProblems likelyProblems = new likelyProblems(likelyProblem);                        mlikelyProblems.add(likelyProblems);                    }     mRecyclerVIEw.setAdapter(likelyProblemAdapter);\     likelyProblemAdapter.notifyDataSetChanged();

像这样更改您的布局

<linearLayout xmlns:androID="http://schemas.androID.com/apk/res/androID"xmlns:tools="http://schemas.androID.com/tools"androID:ID="@+ID/activity_likely_problems"androID:layout_wIDth="match_parent"androID:layout_height="match_parent"androID:paddingBottom="@dimen/zerodimen"androID:paddingleft="@dimen/zerodimen"androID:paddingRight="@dimen/zerodimen"androID:paddingtop="@dimen/zerodimen"androID:background="@color/colorBackground"androID:orIEntation="vertical"tools:context="com.example.system2.tranxav.likelyProblemsActivity"><androID.support.v7.Widget.Toolbar    androID:layout_wIDth="match_parent"    androID:layout_height="wrap_content"    androID:ID="@+ID/toolbar"    androID:background="@color/background" /><androID.support.v4.Widget.SwipeRefreshLayout    androID:layout_wIDth="match_parent"    androID:layout_height="wrap_content"    androID:ID="@+ID/likelyProblemSwipetoRefresh">         <androID.support.v7.Widget.RecyclerVIEw    androID:layout_below="@ID/toolbar"    androID:ID="@+ID/likelyProblemRecyclerVIEw"    androID:layout_wIDth="match_parent"    androID:layout_height="wrap_content" /></androID.support.v4.Widget.SwipeRefreshLayout></linearLayout>

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