MySQL-Daten werden nicht in Android RecyclerView angezeigt (Logcat-Fehler: Konnte Memtrack-Modul nicht laden)

Question

Ich habe gerade angefangen, Android-Anwendung zu entwickeln. Ich habe XAMPP verwendet, um die Datenbank (MYSQL) und PHP zu generieren, um die extrahierten Daten in JSON zu konvertieren. Allerdings konnte ich die folgende JSON-Ausgabe in Android Recyclerview nicht anzeigen, und beim Erstellen dieser Anwendung wird kein Fehler generiert. Ich habe auch einige andere Beispiele/Lösungen von dieser Website erwähnt, aber ich konnte dieses Problem immer noch nicht lösen. Der Code, den ich benutzt habe, ist unten. Darf ich wissen, welcher Teil korrigiert werden kann oder fehlt?

herblist.php

<?php 
include 'dbConnect.php'; 

// Create connection 
$conn = new mysqli($HostName, $HostUser, $HostPass, $DatabaseName); 

if ($conn->connect_error) { 
    die("Connection failed: " . $conn->connect_error); 
} 

mysqli_set_charset($conn, 'utf8'); 
$sql = "SELECT * FROM herb"; 

$result = $conn->query($sql); 

if ($result->num_rows >0) { 
    while($row[] = $result->fetch_assoc()) { 
     $tem = $row; 
     $json = json_encode($tem); 
    } 

} else { 
    echo "No Results Found."; 
} 

echo $json; 
$conn->close(); 
?> 

JSON (MYSQL Daten zu konvertieren JSON) durch herblist.php erzeugt

[{"h_name":"Basil","h_image":"http:\/\/localhost\/Herb\/Herb_image\/basil.jpg"},{"h_name":"Cilantro","h_image":"http:\/\/localhost\/Herb\/Herb_image\/cilantro.jpg"},{"h_name":"Kaffir lime leaf","h_image":"http:\/\/localhost\/Herb\/Herb_image\/kaffir_lime.jpg"},{"h_name":"Lemongrass","h_image":"http:\/\/localhost\/Herb\/Herb_image\/lemongrass.jpg"},{"h_name":"Mint","h_image":"http:\/\/localhost\/Herb\/Herb_image\/mint.jpg"},{"h_name":"Oregano","h_image":"http:\/\/localhost\/Herb\/Herb_image\/oregano.jpg"},{"h_name":"Pandan leaf","h_image":"http:\/\/localhost\/Herb\/Herb_image\/pandan.jpg"},{"h_name":"Parsley","h_image":"http:\/\/localhost\/Herb\/Herb_image\/parsley.jpg"},{"h_name":"Rosemary","h_image":"http:\/\/localhost\/Herb\/Herb_image\/rosemary.jpg"},{"h_name":"Thyme","h_image":"http:\/\/localhost\/Herb\/Herb_image\/thyme.jpg"}] 

searchActivity.java (die Hauptaktivität)

public class searchActivity extends AppCompatActivity { 

List<DataAdapter> ListDataAdapter; 
RecyclerView recyclerView; 
String HTTP_JSON_URL = "http://localhost/Herb/herblist.php"; 
String Image_Name_JSON = "h_name"; 
String Image_URL_JSON = "h_image"; 
JsonArrayRequest RequestOfJSonArray ; 
RequestQueue requestQueue ; 
View view ; 
int RecyclerViewItemPosition ; 
RecyclerView.LayoutManager RecyclerViewLayoutManager; 
RecyclerView.Adapter recyclerViewadapter; 
ArrayList<String> ImageTitleNameArrayListForClick; 

@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_search); 
    ImageTitleNameArrayListForClick = new ArrayList<>(); 
    ListDataAdapter = new ArrayList<>(); 
    recyclerView = (RecyclerView) findViewById(R.id.recyclerview1); 
    recyclerView.setHasFixedSize(true); 
    RecyclerViewLayoutManager = new LinearLayoutManager(this); 
    recyclerView.setAdapter(recyclerViewadapter); 
    recyclerView.setLayoutManager(RecyclerViewLayoutManager); 
    JSON_HTTP_CALL(); 

    // Implementing Click Listener on RecyclerView. 
    recyclerView.addOnItemTouchListener(new RecyclerView.OnItemTouchListener() { 
     GestureDetector gestureDetector = new GestureDetector(searchActivity.this, new GestureDetector.SimpleOnGestureListener() { 
      @Override public boolean onSingleTapUp(MotionEvent motionEvent) { 
       return true; 
      } 

     }); 
     @Override 
     public boolean onInterceptTouchEvent(RecyclerView Recyclerview, MotionEvent motionEvent) { 
      view = Recyclerview.findChildViewUnder(motionEvent.getX(), motionEvent.getY()); 
      if(view != null && gestureDetector.onTouchEvent(motionEvent)) { 

       //Getting RecyclerView Clicked Item value. 
       RecyclerViewItemPosition = Recyclerview.getChildAdapterPosition(view); 

       // Showing RecyclerView Clicked Item value using Toast. 
       Toast.makeText(searchActivity.this, ImageTitleNameArrayListForClick.get(RecyclerViewItemPosition), Toast.LENGTH_LONG).show(); 
      } 

      return false; 
     } 

     @Override 
     public void onTouchEvent(RecyclerView Recyclerview, MotionEvent motionEvent) { 

     } 
     @Override 
     public void onRequestDisallowInterceptTouchEvent(boolean disallowIntercept) { 

     } 
    }); 
} 

public void JSON_HTTP_CALL(){ 

    RequestOfJSonArray = new JsonArrayRequest(HTTP_JSON_URL, 
      new Response.Listener<JSONArray>() { 
       @Override 
       public void onResponse(JSONArray response) { 
        ParseJSonResponse(response); 
       } 
      }, 
      new Response.ErrorListener() { 
       @Override 
       public void onErrorResponse(VolleyError error) { 

       } 
      }); 

    requestQueue = Volley.newRequestQueue(searchActivity.this); 
    requestQueue.add(RequestOfJSonArray); 
} 

public void ParseJSonResponse(JSONArray array){ 
    for(int i = 0; i<array.length(); i++) { 
     DataAdapter GetDataAdapter2 = new DataAdapter(); 
     JSONObject json = null; 
     try { 
      json = array.getJSONObject(i); 
      GetDataAdapter2.setImageTitle(json.getString(Image_Name_JSON)); 

      // Adding image title name in array to display on RecyclerView click event. 
     ImageTitleNameArrayListForClick.add(json.getString(Image_Name_JSON)); 

      GetDataAdapter2.setImageUrl(json.getString(Image_URL_JSON)); 

     } catch (JSONException e) { 
      e.printStackTrace(); 
     } 
     ListDataAdapter.add(GetDataAdapter2); 
    } 

    recyclerViewadapter = new RecyclerViewAdapter(ListDataAdapter, this); 
    recyclerView.setAdapter(recyclerViewadapter); 
    } 
    } 

DataAdapter.java (das Adapterteil des Textes in cardview)

public class DataAdapter{ 
    public String ImageURL; 
    public String ImageTitle; 

    public String getImageUrl() {return ImageURL;} 

    public void setImageUrl(String ImageServerUrl) {this.ImageURL = ImageServerUrl;} 

    public String getImageTitle() {return ImageTitle;} 

    public void setImageTitle(String ImageTitleName) {this.ImageTitle = ImageTitleName;} 
} 

ImageAdapter.java (das Adapterteil des Bildes in cardview)

public class ImageAdapter { 

public static ImageAdapter imageAdapter; 
public Network networkOBJ ; 
public RequestQueue requestQueue1; 
public ImageLoader Imageloader1; 
public Cache cache1 ; 
public static Context context1; 

LruCache<String, Bitmap> LRUCACHE = new LruCache<String, Bitmap>(30); 

private ImageAdapter(Context context) { 
    this.context1 = context; 
    this.requestQueue1 = RequestQueueFunction(); 
    Imageloader1 = new ImageLoader(requestQueue1, new ImageLoader.ImageCache() { 

@Override 
public Bitmap getBitmap(String URL) { 
    return LRUCACHE.get(URL); 
} 

@Override 
public void putBitmap(String url, Bitmap bitmap) { 
    LRUCACHE.put(url, bitmap); 
} 
}); 
    } 

public ImageLoader getImageLoader() { 
    return Imageloader1; 
    } 

public static ImageAdapter getInstance(Context SynchronizedContext) { 

    if (imageAdapter == null) { 
    imageAdapter = new ImageAdapter(SynchronizedContext); 
    } 
    return imageAdapter; 
    } 

public RequestQueue RequestQueueFunction() { 

    if (requestQueue1 == null) { 
    cache1 = new DiskBasedCache(context1.getCacheDir()); 
    networkOBJ = new BasicNetwork(new HurlStack()); 
    requestQueue1 = new RequestQueue(cache1, networkOBJ); 
    requestQueue1.start(); 
    } 
    return requestQueue1; 
} 
} 

RecyclerViewAdapter.java

public class RecyclerViewAdapter extends RecyclerView.Adapter<RecyclerViewAdapter.ViewHolder> { 

Context context; 
List<DataAdapter> dataAdapters; 
ImageLoader imageLoader; 

public RecyclerViewAdapter(List<DataAdapter> getDataAdapter, Context context){ 
    super(); 
    this.dataAdapters = getDataAdapter; 
    this.context = context; 
} 

@Override 
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) { 
    View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.cardview, parent, false); 
    ViewHolder viewHolder = new ViewHolder(view); 
    return viewHolder; 
} 

@Override 
public void onBindViewHolder(ViewHolder Viewholder, int position) { 
    DataAdapter dataAdapterOBJ = dataAdapters.get(position); 
    imageLoader = ImageAdapter.getInstance(context).getImageLoader(); 
    imageLoader.get(dataAdapterOBJ.getImageUrl(), 
      ImageLoader.getImageListener(
        Viewholder.VollyImageView,//Server Image 
        R.mipmap.ic_launcher,//Before loading server image the default showing image. 
        android.R.drawable.ic_dialog_alert //Error image if requested image dose not found on server. 
      ) 
    ); 

    Viewholder.VollyImageView.setImageUrl(dataAdapterOBJ.getImageUrl(), imageLoader); 
    Viewholder.ImageTitleTextView.setText(dataAdapterOBJ.getImageTitle()); 

} 

@Override 
public int getItemCount() { 
    return dataAdapters.size(); 
} 

class ViewHolder extends RecyclerView.ViewHolder{ 

    public TextView ImageTitleTextView; 
    public NetworkImageView VollyImageView ; 

    public ViewHolder(View itemView) { 
     super(itemView); 
     ImageTitleTextView = (TextView) itemView.findViewById(R.id.ImageNameTextView) ; 
     VollyImageView = (NetworkImageView) itemView.findViewById(R.id.VolleyImageView) ; 
    } 
} 
} 

activity_search.xml (xml-Datei der Haupttätigkeit)

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    xmlns:tools="http://schemas.android.com/tools" 
    android:id="@+id/activity_main" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" > 

    <android.support.v7.widget.RecyclerView 
     android:id="@+id/recyclerview1" 
     android:layout_width="fill_parent" 
     android:layout_height="fill_parent" /> 
</RelativeLayout> 

cardview.xml

<android.support.v7.widget.CardView 
    xmlns:android="http://schemas.android.com/apk/res/android" 
    xmlns:card_view="http://schemas.android.com/apk/res-auto" 
    android:id="@+id/cardview1" 
    android:layout_width="match_parent" 
    android:layout_height="wrap_content" 
    card_view:cardElevation="5dp" 
    card_view:contentPadding="5dp" 
    card_view:cardCornerRadius="5dp" 
    card_view:cardMaxElevation="5dp" 
    > 

    <RelativeLayout 
     android:layout_width="fill_parent" 
     android:layout_height="wrap_content" 
     android:background="#ECEFF1"> 

     <com.android.volley.toolbox.NetworkImageView 
      android:id="@+id/VolleyImageView" 
      android:layout_width="150dp" 
      android:layout_height="100dp" 
      android:src="@mipmap/ic_launcher" 
      android:layout_marginTop="10dp" 
      android:layout_marginBottom="10dp"/> 

     <TextView 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:layout_toEndOf="@+id/VolleyImageView" 
      android:textSize="20sp" 
      android:textColor="#000" 
      android:text="JSon Image Name" 
      android:id="@+id/ImageNameTextView" 
      android:layout_centerVertical="true"/> 
    </RelativeLayout> 
</android.support.v7.widget.CardView> 

Answer 1

Erste Änderung dieser

recyclerView.setHasFixedSize(true); 
RecyclerViewLayoutManager = new LinearLayoutManager(this); 
recyclerView.setAdapter(recyclerViewadapter); 
recyclerView.setLayoutManager(RecyclerViewLayoutManager); 

Um

recyclerView.setHasFixedSize(true); 
recyclerView.setLayoutManager(new LinearLayoutManager(this)); 
recyclerViewadapter = new RecyclerViewAdapter(ListDataAdapter, this); 
recyclerView.setAdapter(recyclerViewadapter); 

Zweite diese zwei Linie von JSON_HTTP_CALL() -Methode entfernen

recyclerViewadapter = new RecyclerViewAdapter(ListDataAdapter, this); 
recyclerView.setAdapter(recyclerViewadapter); 

und setzen Sie diese Zeile

recyclerViewadapter.notifyDataSetChanged();