Recyclerview, auf Klick Highlight und andere nicht hervorgehoben

Question

Ich habe eine Recyclerview von Kreditkarten, wenn Sie auf einen klicken Ich möchte es die Hintergrundressource von diesem ändern und alle anderen zurück auf Standard setzen, aus irgendeinem Grund Ich habe das seit ungefähr 5 Stunden gekämpft und kann es nicht richtig machen. Hier

ist die andernfalls Klasse

public class CheckOutCardRecycler extends RecyclerView.Adapter<CheckOutCardRecycler.CardViewHolder>{ 

    private List<Card> checkOutCard; 
    private int screenWidth; 
    private int selected; 






    public CheckOutCardRecycler(Activity activity, List<Card> checkOutCard){ 


     Display display = activity.getWindowManager().getDefaultDisplay(); 
     Point size = new Point(); 
     display.getSize(size); 
     this.screenWidth = size.x; 
     this.checkOutCard = checkOutCard; 
     selected=-1; 


    } 



    public static class CardViewHolder extends RecyclerView.ViewHolder { 
     CardView card; 
     LinearLayout row; 
     static TextView etCardNumber; 
     static TextView etName; 
     static TextView etDate; 
     static LinearLayout creditCard; 



     CardViewHolder(View itemView) { 
      super(itemView); 
      card = (CardView)itemView.findViewById(R.id.card_view); 
      etCardNumber = (TextView)itemView.findViewById(R.id.etCardNumber); 
      etName = (TextView)itemView.findViewById(R.id.etName); 
      etDate = (TextView)itemView.findViewById(R.id.etDate); 
      creditCard = (LinearLayout) itemView.findViewById(R.id.creditCard); 

     } 
    } 

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

    public int getSelected() { 
     return selected; 
    } 

    public int getPaymentMethod(int i) { 
     return Integer.parseInt(checkOutCard.get(i).getId()); 
    } 


    @Override 
    public CardViewHolder onCreateViewHolder(ViewGroup viewGroup, int i) { 
     View v = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.row_checkout_cards, viewGroup, false); 
     CardViewHolder pvh = new CardViewHolder(v); 

     return pvh; 
    } 

    @Override 
    public void onBindViewHolder(final CardViewHolder cardViewHolder, final int i) { 
     CardViewHolder.etCardNumber.setText("**** **** **** " + checkOutCard.get(i).getLast_four_digits()); 
     CardViewHolder.etName.setText(checkOutCard.get(i).getName()); 
     CardViewHolder.etDate.setText(checkOutCard.get(i).getExpiry_month() +"/"+checkOutCard.get(i).getExpiry_year().substring(2,4)); 
     if (selected<0) 
      if (checkOutCard.get(i).getDefaultcard()==1){ 
       selected=i; 
      } 

     CardViewHolder.creditCard.setOnClickListener(new View.OnClickListener() 
     { 
      @Override 
      public void onClick(View v) 
      { 

       if (i!=selected) { 

        checkOutCard.get(selected).setDefaultcard(0); 
        checkOutCard.get(i).setDefaultcard(1); 
        selected=-1; 

        notifyDataSetChanged(); 




       } 
      } 
     }); 


     if (selected==i){ 
      if (checkOutCard.get(i).getBrand().toLowerCase().equals("visa")) 
       CardViewHolder.creditCard.setBackgroundResource(R.drawable.paymentscreenvisaselected); 
      else if (checkOutCard.get(i).getBrand().toLowerCase().equals("mastercard")) 
       CardViewHolder.creditCard.setBackgroundResource(R.drawable.paymentscreenmastercardselected); 
      else 
       CardViewHolder.creditCard.setBackgroundResource(R.drawable.paymentscreenselected); 
     } 
     else { 

      if (checkOutCard.get(i).getBrand().toLowerCase().equals("visa")) 
       CardViewHolder.creditCard.setBackgroundResource(R.drawable.paymentscreenvisa); 
      else if (checkOutCard.get(i).getBrand().toLowerCase().equals("mastercard")) 
       CardViewHolder.creditCard.setBackgroundResource(R.drawable.paymentscreenmastercard); 
      else 
       CardViewHolder.creditCard.setBackgroundResource(R.drawable.paymentscreen); 

     } 


    } 

    @Override 
    public void onAttachedToRecyclerView(RecyclerView recyclerView) { 
     super.onAttachedToRecyclerView(recyclerView); 

    } 




} 

Answer 1

Vielen Dank für Ihre Antworten, endlich nach Tagen der versuchen alle Ihre Lösungen und keiner von ihnen funktioniert und nicht herausfinden, warum ich endlich herausgefunden, hatte ich eine dumme Syntax-Problem, das mir Kopfschmerzen verursacht.

Alles, was ich tun musste, war innen onBindViewHolder Ich musste alle CardViewHolder zu cardViewHolder ändern. Ich denke, das macht diese Frage ziemlich sinnlos für andere Menschen, so meine Apollies und nochmals vielen Dank für die Mühe, die die anderen Leute, die in der Länge Antworten gemacht

Answer 2

Ihren Adapter ruffly etwas sollte wie folgt aussehen:

public class CardAdapter extends RecyclerView.Adapter<CardAdapter.CardViewHolder> { 
    private Context context; 
    private List<Card> checkOutCard; 
    private int screenWidth; // I really think you shouldn't calculate your width in the adapter but before your create it. 
    private Card selected; 

    public CardAdapter(Context context, List<Card> checkOutCard, int screenWidth) { 
     this.context = context; 
     this.screenWidth = screenWidth; 
     this.checkOutCard = checkOutCard; 
    } 

    protected Context getContext() { 
     return context; 
    } 

    protected Card getItem(int position){ 

    } 

    public Card getSelected() { 
     return selected; 
    } 

    public void setSelected(Card selected) { 
     this.selected = selected; 
    } 

    @Override 
    public CardViewHolder onCreateViewHolder(ViewGroup parent, int viewType) { 
     return new CardViewHolder(LayoutInflater.from(getContext()).inflate(R.layout.row_checkout_cards, parent, false)); 
    } 

    @Override 
    public void onBindViewHolder(CardViewHolder holder, int position) { 
     Card currentCard = getItem(position); 
     holder.bind(currentCard, currentCard == selected); 

    } 

    @Override 
    public int getItemCount() { 
     return 0; 
    } 

    public static class CardViewHolder extends RecyclerView.ViewHolder { 
     CardView card; 
     LinearLayout row; 
     static TextView etCardNumber; 
     static TextView etName; 
     static TextView etDate; 
     static LinearLayout creditCard; 

     CardViewHolder(View itemView) { 
      super(itemView); 
      card = (CardView)itemView.findViewById(R.id.card_view); 
      etCardNumber = (TextView)itemView.findViewById(R.id.etCardNumber); 
      etName = (TextView)itemView.findViewById(R.id.etName); 
      etDate = (TextView)itemView.findViewById(R.id.etDate); 
      creditCard = (LinearLayout) itemView.findViewById(R.id.creditCard); 

     } 

     public void bind(Card card, boolean isSelected){ 
      etCardNumber.setText("**** **** **** " + card.getLast_four_digits()); 
      etName.setText(card.getName()); 
      etDate.setText(card.getExpiry_month() +"/"+card.getExpiry_year().substring(2,4)); 
      if (isSelected) 
       if (card.getDefaultcard()==1){ 
        selected=i; 
       } 

      creditCard.setOnClickListener(new View.OnClickListener() 
      { 
       @Override 
       public void onClick(View v) 
       { 

        if (i!=selected) { 

         checkOutCard.get(selected).setDefaultcard(0); 
         card.setDefaultcard(1); 
         selected=-1; 

         notifyDataSetChanged(); 




        } 
       } 
      }); 


      if (selected==i){ 
       if (card.getBrand().toLowerCase().equals("visa")) 
        creditCard.setBackgroundResource(R.drawable.paymentscreenvisaselected); 
       else if (card.getBrand().toLowerCase().equals("mastercard")) 
        creditCard.setBackgroundResource(R.drawable.paymentscreenmastercardselected); 
       else 
        creditCard.setBackgroundResource(R.drawable.paymentscreenselected); 
      } 
      else { 

       if (card.getBrand().toLowerCase().equals("visa")) 
        creditCard.setBackgroundResource(R.drawable.paymentscreenvisa); 
       else if (card.getBrand().toLowerCase().equals("mastercard")) 
        creditCard.setBackgroundResource(R.drawable.paymentscreenmastercard); 
       else 
        creditCard.setBackgroundResource(R.drawable.paymentscreen); 

      } 
     } 
    } 
} 

Answer 3

Hier ist ein funktionierendes Beispiel:

Der Adapter:

public class TestAdapter extends RecyclerView.Adapter<TestAdapter.TestViewHolder> { 


    private List<String> mData; 
    Context mContext; 
    RecyclerView mRecyclerView; 


    public class TestViewHolder extends RecyclerView.ViewHolder{ 

     LinearLayout mListItemLayout; 
     TextView mTextView; 
     int mPosition; 

     public TestViewHolder(final View itemView) { 
      super(itemView); 
      mListItemLayout = (LinearLayout) itemView.findViewById(R.id.list_item); 
      mTextView = (TextView) itemView.findViewById(R.id.list_item_text); 
      mListItemLayout.setOnClickListener(new View.OnClickListener() { 
       @Override 
       public void onClick(View v) { 
        itemView.setBackgroundColor(Color.RED); 
        grayBackgroundOfOtherItems(); 
       } 
      }); 

     } 

     public void setPosition(int position){ 
      mPosition = position; 
     } 

     private void grayBackgroundOfOtherItems(){ 

      int size = mData.size(); 
      for(int i=0; i<size; i++){ 
       if(i != mPosition){ 
        TestViewHolder viewHolder = (TestViewHolder) mRecyclerView.findViewHolderForAdapterPosition(i); 
        ((TestViewHolder) mRecyclerView.findViewHolderForAdapterPosition(i)). 
              mListItemLayout.setBackgroundColor(Color.LTGRAY); 
       } 
      } 
     } 

    } 

    public TestAdapter(Context context, RecyclerView recyclerView){ 

     this.mContext = context; 
     this.mRecyclerView = recyclerView; 
     initData(); 
    } 

    private void initData(){ 

     mData = new ArrayList<String>(); 
     mData.add("Africa"); 
     mData.add("Antartica"); 
     mData.add("Asia"); 
     mData.add("Australia"); 
     mData.add("Europe"); 
     mData.add("North America"); 
     mData.add("South America"); 
    } 

    @Override 
    public TestViewHolder onCreateViewHolder(ViewGroup parent, int viewType) { 

     View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.recycler_item, parent, false); 
     TestViewHolder viewHolder = new TestViewHolder(view); 
     return viewHolder; 
    } 

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

     holder.mTextView.setText(mData.get(position)); 
     holder.setPosition(position); 
    } 

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

Die Aktivität:

public class CardViewActivity extends AppCompatActivity{ 

    RecyclerView mRecyclerView; 


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

     mRecyclerView = (RecyclerView) findViewById(R.id.recycler_view); 
     mRecyclerView.setLayoutManager(new LinearLayoutManager(this)); 
     mRecyclerView.setAdapter(new TestAdapter(this,mRecyclerView)); 
    } 
} 

die Aktivität des Layout:

<?xml version="1.0" encoding="utf-8"?> 
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    xmlns:tools="http://schemas.android.com/tools" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    android:paddingBottom="@dimen/activity_vertical_margin" 
    android:paddingLeft="@dimen/activity_horizontal_margin" 
    android:paddingRight="@dimen/activity_horizontal_margin" 
    android:paddingTop="@dimen/activity_vertical_margin" 
    tools:context=".stack_overflow_cardview.CardViewActivity"> 

    <android.support.v7.widget.RecyclerView 
     android:id="@+id/recycler_view" 
     android:layout_width="match_parent" 
     android:layout_height="match_parent"> 
    </android.support.v7.widget.RecyclerView> 

</RelativeLayout> 

und jeder Listenpunkt Layout:

<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    android:id = "@+id/list_item" 
    android:orientation="vertical" 
    android:layout_width="match_parent" 
    android:layout_height="50dp" 
    android:layout_marginTop="10dp"> 

    <TextView 
     android:id = "@+id/list_item_text" 
     android:layout_width = "wrap_content" 
     android:layout_height = "wrap_content" /> 

</LinearLayout> 

Und ein Screenshot:

Ich hoffe, das war nützlich.

Bearbeiten: Wenn Sie nicht glücklich sind, Ihre RecyclerView zu verbinden, indem Sie eine Referenz davon in Ihren Adapter bringen, könnten Sie eine Schnittstelle verwenden, die Ihre Aktivität/Fragment implementieren muss und die Position an die Schnittstellenmethode übergeben.