实施的onClick在Recyclerview适配器

问题描述：

我想知道如何实现的onClick为每个项目在我格（使用回收站查看和卡视图）推出一个新的 activity.Below是我ViewHolder类和RecyclerView适配器类实施的onClick在Recyclerview适配器

这是我RecyclerView适配器类别

import android.app.Activity; 
import android.content.Context; 
import android.content.Intent; 
import android.nfc.Tag; 
import android.nfc.TagLostException; 
import android.support.v7.widget.RecyclerView; 
import android.util.Log; 
import android.view.LayoutInflater; 
import android.view.View; 
import android.view.ViewGroup; 
import android.widget.Toast; 

import java.util.List; 

public class RecyclerViewAdapter extends RecyclerView.Adapter<RecyclerViewHolders> { 

    private List<ItemObject> itemList; 
    private Context context; 

    public RecyclerViewAdapter(Context context, List<ItemObject> itemList) { 
     this.itemList = itemList; 
     this.context = context; 
    } 

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

     View layoutView = LayoutInflater.from(parent.getContext()).inflate(R.layout.card_view_list, null); 
     RecyclerViewHolders rcv = new RecyclerViewHolders(layoutView); 
     return rcv; 
    } 

    @Override 
    public void onBindViewHolder(RecyclerViewHolders holder, final int position) { 
     holder.countryName.setText(itemList.get(position).getName()); 
     holder.countryPhoto.setImageResource(itemList.get(position).getPhoto()); 
     holder.countryPhoto.setOnClickListener(new View.OnClickListener() { 
      @Override 
      public void onClick(View view) { 
       Toast.makeText(view.getContext(),"This is Maps",Toast.LENGTH_SHORT).show(); 

      } 
     }); 
    } 

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

//This is my Recycler View Holder Class 


import android.content.Intent; 
import android.support.v7.widget.RecyclerView; 
import android.util.Log; 
import android.view.View; 
import android.widget.ImageView; 
import android.widget.TextView; 
import android.widget.Toast; 

public class RecyclerViewHolders extends RecyclerView.ViewHolder implements View.OnClickListener { 

    public TextView countryName; 
    public ImageView countryPhoto; 

    public RecyclerViewHolders(View itemView) { 
     super(itemView); 
     itemView.setOnClickListener(this); 
     countryName = (TextView) itemView.findViewById(R.id.country_name); 
     countryPhoto = (ImageView) itemView.findViewById(R.id.country_photo); 
    } 

    @Override 
    public void onClick(View view) { 
     Toast.makeText(view.getContext(), "Clicked Country Position = " + getPosition(), Toast.LENGTH_SHORT).show(); 


    } 
}

问题是什么？ – Enzokie

为什么你在查看持有者中添加了点击监听器？ –

答

我用接口作为Callba CK来处理这种情况。

首先，我在Adapter中创建一个接口类。

public class RecyclerViewAdapter extends RecyclerView.Adapter<RecyclerViewHolders> { 

    private List<ItemObject> itemList; 
    private Context context; 
    private ItemClickListener mItemClickListener; 

    public RecyclerViewAdapter(Context context, List<ItemObject> itemList) { 
     this.itemList = itemList; 
     this.context = context; 
    } 

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

     View layoutView = LayoutInflater.from(parent.getContext()).inflate(R.layout.card_view_list, null); 
     RecyclerViewHolders rcv = new RecyclerViewHolders(layoutView); 
     return rcv; 
    } 

    public void addItemClickListener(ItemClickListener listener) { 
     mItemClickListener = listener; 
    } 

    @Override 
    public void onBindViewHolder(RecyclerViewHolders holder, final int position) { 
     holder.countryName.setText(itemList.get(position).getName()); 
     holder.countryPhoto.setImageResource(itemList.get(position).getPhoto()); 
     holder.countryPhoto.setOnClickListener(new View.OnClickListener() { 
      @Override 
      public void onClick(View view) { 
       if (mItemClickListener != null) { 
        mItemClickListener.onItemClick(position); 
       } 
      } 
     }); 
    } 

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

    //Define your Interface method here 
    public interface ItemClickListener { 
     void onItemClick(int position); 
    } 
}

然后，让我们的Activity或Fragment实现Interface并添加侦听器。

public class MyFragment extends Fragment 
    implements RecyclerViewAdapter.ItemClickListener { 

    private List<ItemObject> mItemList; 
    ... 
    @Override 
    public View onCreateView(final LayoutInflater inflater, final ViewGroup container, 
          final Bundle savedInstanceState) { 
     ... 
     //Make sure mItemList not NULL 
     RecyclerViewAdapter adapter = new RecyclerViewAdapter(getContext(), mItemList); 
     //Add Item Click listener 
     adapter.addItemClickListener(this); 
    } 


    @Override 
    public void onItemClick(int position) { 
     Toast.makeText(.getContext(),"Click on item: " + position,Toast.LENGTH_SHORT).show(); 
    } 
}

希望这会有所帮助！

谢谢你的答案..是的，他们会为我工作 – Xcoder

@Xcoder :)很高兴听到这种帮助 –

答

你的代码看起来像细，如果询问如何创造意图在这里开设新的活动激起你应该改变

是偷懒的办法不推荐最好的初步实践

使静态变量在你勉activty女巫持有refrance一些事情一样，

 public class MainActivity extends AppCompatActivity 

public static Activity activity; 


      @Override 
      protected void onCreate(Bundle savedInstanceState) { 
       super.onCreate(savedInstanceState); 
       setContentView(R.layout.activity_main); 
       Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar); 
       setSupportActionBar(toolbar); 
       getSupportActionBar().setElevation(0); 

       activity=this; 

     } 
    }

，然后你点击

内0

... 

      @Override 
      public void onClick(View v) { 
Toast.makeText(.getContext(),"Click on item: " + position,Toast.LENGTH_SHORT).show(); 
       startActivity(new Intent(MainActivity.activity, MyOtherActivity.class)); 
      } 

...

谢谢..我会试试 – Xcoder

告诉我，如果它工作 – Hamza

答

我不是你的初始后您的问题而完全清楚，但如果你想要做的就是在你RecyclerViewAdapter实施OnClickListener，只需添加以下内容：

首先，改变你的类声明为此：

public class RecyclerViewAdapter extends RecyclerView.Adapter<RecyclerViewHolders> implements OnClickListener {

然后，你的onClick方法添加到类，完成接口。

@Override 
public void onClick(View view) { 
    Toast.makeText(this.getContext(),"Code to change activity goes here." ,Toast.LENGTH_SHORT).show(); 
}

最后，你需要在你的适配器类设置一个OnClickListener。

@Override 
public void onBindViewHolder(RecyclerViewHolders holder, final int position) { 
    holder.setOnClickListener(this); 
    holder.countryName.setText(itemList.get(position).getName()); 
    holder.countryPhoto.setImageResource(itemList.get(position).getPhoto()); 
    holder.countryPhoto.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View view) { 
      if (mItemClickListener != null) { 
       mItemClickListener.onItemClick(position); 
      } 
     } 
    }); 
}

现在，我个人不会这样做。我会做的，而不是为添加一个私有内部类适配器，这样的：在你调用适配器

private AdapterOnClickListener implements OnClickListener() { 
    private String message; 

    public AdapterOnClickListener (String toast) { 
     message = toast; 
    } 

    public void onClick (View v) { 
     Toast.makeText(this.getContext(),toast ,Toast.LENGTH_SHORT).show(); 
    } 

}

然后：

@Override 
public void onBindViewHolder(RecyclerViewHolders holder, final int position) { 
    holder.setOnClickListener(new AdapterOnClickListener ("Instead of a string, I can be an intent. Then in your listener, you can call (If I recall correctly) getContext().startActivity(intent), and have an activity."); 
    holder.countryName.setText(itemList.get(position).getName()); 
    holder.countryPhoto.setImageResource(itemList.get(position).getPhoto()); 
    holder.countryPhoto.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View view) { 
      if (mItemClickListener != null) { 
       mItemClickListener.onItemClick(position); 
      } 
     } 
    }); 
}

实施的onClick在Recyclerview适配器

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