RecyclerView und CardView implementieren onClick

Question

Ich habe eine Reihe von Werten, die aus mysql-Datenbank abgerufen werden und dann in cardview mit RecyclerView angezeigt werden. Das funktioniert großartig.

Ich möchte jetzt onClick auf jedes Element, das gezogen wird, implementieren kann jemand bitte zeigen Sie mir in die richtige Richtung? Ich bin in der Lage, auf eine Karte zu klicken und eine andere Ansicht geöffnet mit den "Bild", "Name" und "Herausgeber" -Werte, die von MySQL mit JSON gezogen werden, Problem ist, ich weiß nicht, wie Sie diese übergeben Werte auf eine neue Aktivität, insbesondere die Werte, die aus mysql abgerufen werden.

Movies.java

public class Movies extends AppCompatActivity implements RecyclerView.OnScrollChangeListener { 

//Creating a List of superheroes 
private List<SuperHero> listSuperHeroes; 

//Creating Views 
private RecyclerView recyclerView; 
private RecyclerView.LayoutManager layoutManager; 
private RecyclerView.Adapter adapter; 

//Volley Request Queue 
private RequestQueue requestQueue; 

//The request counter to send ?page=1, ?page=2 requests 
private int requestCount = 1; 

@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.movies); 

    getSupportActionBar().setDisplayHomeAsUpEnabled(true); 

    //Initializing Views 
    recyclerView = (RecyclerView) findViewById(R.id.recyclerView); 
    recyclerView.setHasFixedSize(true); 
    layoutManager = new GridLayoutManager(this,2); 
    recyclerView.setLayoutManager(layoutManager); 

    recyclerView.addItemDecoration(new DividerItemDecoration(this, DividerItemDecoration.HORIZONTAL_LIST)); 
    recyclerView.setItemAnimator(new DefaultItemAnimator()); 

    //Initializing our superheroes list 
    listSuperHeroes = new ArrayList<>(); 
    requestQueue = Volley.newRequestQueue(this); 

    //Calling method to get data to fetch data 
    getData(); 

    //Adding an scroll change listener to recyclerview 
    recyclerView.setOnScrollChangeListener(this); 

    //initializing our adapter 
    adapter = new CardAdapter(listSuperHeroes, this); 

    //Adding adapter to recyclerview 
    recyclerView.setAdapter(adapter); 
} 

//Add back button to go back 
@Override 
public void onBackPressed() { 
    super.onBackPressed(); 
    overridePendingTransition(R.anim.activity_back_in, R.anim.activity_back_out); 
} 

public boolean onSupportNavigateUp(){ 
    finish(); 
    overridePendingTransition(R.anim.activity_back_in, R.anim.activity_back_out); 
    return true; 
} 

//Request to get json from server we are passing an integer here 
//This integer will used to specify the page number for the request ?page = requestcount 
//This method would return a JsonArrayRequest that will be added to the request queue 
private JsonArrayRequest getDataFromServer(int requestCount) { 
    //Initializing ProgressBar 
    final ProgressBar progressBar = (ProgressBar) findViewById(R.id.progressBar1); 

    //Displaying Progressbar 
    progressBar.setVisibility(View.VISIBLE); 
    setProgressBarIndeterminateVisibility(true); 

    //JsonArrayRequest of volley 
    JsonArrayRequest jsonArrayRequest = new JsonArrayRequest(ConfigMovies.DATA_URL + String.valueOf(requestCount), 
      new Response.Listener<JSONArray>() { 
       @Override 
       public void onResponse(JSONArray response) { 
        //Calling method parseData to parse the json response 
        parseData(response); 
        //Hiding the progressbar 
        progressBar.setVisibility(View.GONE); 
       } 
      }, 
      new Response.ErrorListener() { 
       @Override 
       public void onErrorResponse(VolleyError error) { 
        progressBar.setVisibility(View.GONE); 
        //If an error occurs that means end of the list has reached 
        Toast.makeText(Movies.this, "No More Items Available", Toast.LENGTH_SHORT).show(); 
       } 
      }); 

    //Returning the request 
    return jsonArrayRequest; 
} 

//This method will get data from the web api 
private void getData() { 
    //Adding the method to the queue by calling the method getDataFromServer 
    requestQueue.add(getDataFromServer(requestCount)); 
    //Incrementing the request counter 
    requestCount++; 
} 

//This method will parse json data 
private void parseData(JSONArray array) { 
    for (int i = 0; i < array.length(); i++) { 
     //Creating the superhero object 
     SuperHero superHero = new SuperHero(); 
     JSONObject json = null; 
     try { 
      //Getting json 
      json = array.getJSONObject(i); 

      //Adding data to the superhero object 
      superHero.setImageUrl(json.getString(ConfigMovies.TAG_IMAGE_URL)); 
      superHero.setName(json.getString(ConfigMovies.TAG_NAME)); 
      superHero.setPublisher(json.getString(ConfigMovies.TAG_PUBLISHER)); 
     } catch (JSONException e) { 
      e.printStackTrace(); 
     } 
     //Adding the superhero object to the list 
     listSuperHeroes.add(superHero); 
    } 

    //Notifying the adapter that data has been added or changed 
    adapter.notifyDataSetChanged(); 
} 

//This method would check that the recyclerview scroll has reached the bottom or not 
private boolean isLastItemDisplaying(RecyclerView recyclerView) { 
    if (recyclerView.getAdapter().getItemCount() != 0) { 
     int lastVisibleItemPosition = ((GridLayoutManager) recyclerView.getLayoutManager()).findLastCompletelyVisibleItemPosition(); 
     if (lastVisibleItemPosition != RecyclerView.NO_POSITION && lastVisibleItemPosition == recyclerView.getAdapter().getItemCount() - 1) 
      return true; 
    } 
    return false; 
} 

//Overriden method to detect scrolling 
@Override 
public void onScrollChange(View v, int scrollX, int scrollY, int oldScrollX, int oldScrollY) { 
    //Ifscrolled at last then 
    if (isLastItemDisplaying(recyclerView)) { 
     //Calling the method getdata again 
     getData(); 
    } 
} 
} 

CardAdapter.java

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

//Imageloader to load image 
private ImageLoader imageLoader; 
private Context context; 

//List to store all superheroes 
List<SuperHero> superHeroes; 

//Constructor of this class 
public CardAdapter(List<SuperHero> superHeroes, Context context){ 
    super(); 
    //Getting all superheroes 
    this.superHeroes = superHeroes; 
    this.context = context; 
} 

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

@Override 
public void onBindViewHolder(ViewHolder holder, int position) { 

    //Getting the particular item from the list 
    SuperHero superHero = superHeroes.get(position); 

    //Loading image from url 
    imageLoader = CustomVolleyRequest.getInstance(context).getImageLoader(); 
    imageLoader.get(superHero.getImageUrl(), ImageLoader.getImageListener(holder.imageView, R.drawable.ic_blank, android.R.drawable.ic_dialog_alert)); 

    //Showing data on the views 
    holder.imageView.setImageUrl(superHero.getImageUrl(), imageLoader); 
    holder.textViewName.setText(superHero.getName()); 
    holder.textViewPublisher.setText(superHero.getPublisher()); 

} 

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

class ViewHolder extends RecyclerView.ViewHolder{ 
    //Views 
    public NetworkImageView imageView; 
    public TextView textViewName; 
    public TextView textViewPublisher; 

    //Initializing Views 
    public ViewHolder(View itemView) { 
     super(itemView); 
     imageView = (NetworkImageView) itemView.findViewById(R.id.imageViewHero); 
     textViewName = (TextView) itemView.findViewById(R.id.textViewName); 
     textViewPublisher = (TextView) itemView.findViewById(R.id.textViewPublisher); 
    } 
} 
} 

Movies.xml

<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    xmlns:app="http://schemas.android.com/apk/res-auto" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    android:orientation="vertical"> 
<android.support.v7.widget.RecyclerView 
    android:id="@+id/recyclerView" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    android:layout_centerInParent="true" /> 
<ProgressBar 
    android:id="@+id/progressBar1" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:layout_centerInParent="true" /> 
</LinearLayout> 

superheroes_list.xml

<?xml version="1.0" encoding="utf-8"?> 
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content"> 
<android.support.v7.widget.CardView 
    android:layout_width="match_parent" 
    android:layout_height="wrap_content" 
    android:nestedScrollingEnabled="false" 
    android:layout_alignParentEnd="true" 
    android:layout_marginBottom="3dp"> 
    <LinearLayout 
     android:orientation="vertical" 
     android:layout_width="match_parent" 
     android:layout_height="match_parent" 
     android:padding="@dimen/activity_horizontal_margin"> 
     <com.android.volley.toolbox.NetworkImageView 
      android:layout_width="100dp" 
      android:layout_height="100dp" 
      android:id="@+id/imageViewHero" 
      android:layout_gravity="center_horizontal" /> 
     <TableLayout 
      android:layout_width="match_parent" 
      android:layout_height="wrap_content"> 
      <TableRow> 
       <TextView 
        android:text="Name" 
        android:paddingRight="10dp" 
        android:layout_width="wrap_content" 
        android:layout_height="wrap_content"/> 
       <TextView 
        android:id="@+id/textViewName" 
        android:textStyle="bold" 
        android:layout_width="wrap_content" 
        android:layout_height="wrap_content"/> 
      </TableRow> 
      <TableRow> 
       <TextView 
        android:text="Publisher" 
        android:paddingRight="10dp" 
        android:layout_width="wrap_content" 
        android:layout_height="wrap_content"/> 
       <TextView 
        android:id="@+id/textViewPublisher" 
        android:textStyle="bold" 
        android:layout_width="wrap_content" 
        android:layout_height="wrap_content" /> 
      </TableRow> 
     </TableLayout> 
    </LinearLayout> 
</android.support.v7.widget.CardView> 
</RelativeLayout> 

Answer 1

1. die ViewHolder Klasse Lassen Sie View.OnClickListener implementieren, dann ist es in CardAdapter Klasse bewegen.

2. Anruf setOnClickListener (this) kurz nach Super innerhalb ViewHolder Konstruktor wie das Aufruf:

   public ViewHolder(View itemView) { 
       super(itemView); 
       itemView.setOnClickListener(this); 
       imageView = (NetworkImageView) itemView.findViewById(R.id.imageViewHero); 
       textViewName = (TextView) itemView.findViewById(R.id.textViewName); 
       textViewPublisher = (TextView) itemView.findViewById(R.id.textViewPublisher); 
   } 
   
   @Override 
   public void onClick(View view) { 
       // here you can get your item by calling getAdapterPosition(); 
       SuperHero superHero = superHeroes.get(getAdapterPosition()); 
   }