如何将 Onclick 监听器添加到回收器视图

问题描述 投票：0回答：8

我正在开发一个简单的记事本应用程序，首先我使用listView来显示所有笔记。但现在我使用RecyclerView。当我使用列表视图时，我使用 OnItemClickListener 将数据传递到另一个活动以编辑注释 现在我很困惑在 Recylerview 做什么

对于 listView 我正在使用这个

 listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
        @Override
        public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
            name = filenames.get(position).getName();
            note = filenames.get(position).getShorttext();
            Alert(); // this method is in main activity 

        }
    });*/  


  public void Alert()
   {
    final AlertDialog dialog;
    View mview = getLayoutInflater().inflate(R.layout.dialog_pass,null);
    final EditText mEdittext = (EditText) mview.findViewById(R.id.Epass);
    AlertDialog.Builder mBuilder = new AlertDialog.Builder(MainActivity.this);
    mBuilder.setView(mview);
    mBuilder.setPositiveButton("Ok", new DialogInterface.OnClickListener() {
        @Override
        public void onClick(DialogInterface dialog, int which) {
            String col = mEdittext.getText().toString();
            String password = dBhelper.searchpass(col);
            if (col.equals(password)) {
                Intent intent =  new Intent(MainActivity.this,Note2.class);
                intent.putExtra("Name",name);
                intent.putExtra("Note",note);
                startActivity(intent);
            } else {
                Toast temp = Toast.makeText(MainActivity.this, "Password does not match", Toast.LENGTH_SHORT);
                temp.show();
            }

        }
    });
    mBuilder.setNegativeButton("Cancel",null);
    mBuilder.setCancelable(false);
    dialog = mBuilder.create();
    dialog.show();

     }

现在我应该为回收视图做什么，请帮忙

  public class RecycleViewAdapter extends 
  RecyclerView.Adapter<RecycleViewHolder> {// Recyclerview will extend to
  private List<FileName> fileNames;
  private Context context;

  public RecycleViewAdapter(Context context,List<FileName> fileNames) {
    this.context = context;
    this.fileNames = fileNames;

}

@Override
public RecycleViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
    LayoutInflater mInflater = LayoutInflater.from(parent.getContext());

    ViewGroup mainGroup = (ViewGroup) mInflater.inflate(
            R.layout.grid_item, parent, false);
    RecycleViewHolder listHolder = new RecycleViewHolder(mainGroup);
    return listHolder;

}

@Override
public void onBindViewHolder(RecycleViewHolder holder, final int position) {
    final FileName model = fileNames.get(position);
    RecycleViewHolder mainHolder = (RecycleViewHolder) holder;// holder
    mainHolder.title.setText(model.getName());
    mainHolder.note.setText(model.getShorttext());

}

@Override
public int getItemCount() {
    return (null != fileNames ? fileNames.size() : 0);
  }
android android-recyclerview
8个回答
32
投票

您可以使用两种方法来处理这个问题

1）。手势触摸 https://www.google.co.in/amp/sapandiwakar.in/recycler-view-item-click-handler/amp/

2).使用适配器中的接口 https://antonioleiva.com/recyclerview-listener/

我建议使用界面的第二种方式

如何使用回收项目的界面click

public class RecycleViewAdapter extends 
  RecyclerView.Adapter<RecycleViewHolder> {// Recyclerview will extend to
  private List<FileName> fileNames;
  private Context context;

//declare interface 
  private OnItemClicked onClick;

//make interface like this
  public interface OnItemClicked {
        void onItemClick(int position);
  }

  public RecycleViewAdapter(Context context,List<FileName> fileNames) {
    this.context = context;
    this.fileNames = fileNames;
  }

现在将点击分配给界面

@Override
public void onBindViewHolder(RecycleViewHolder holder, final int position) {
  //............//
  holder.title.setOnClickListener(new View.OnClickListener() {
     @Override
     public void onClick(View v) {
        onClick.onItemClick(position);
     }
  });
}

在适配器类的末尾，从完成括号开始，创建一种方法将 itemclick 分配给界面

public void setOnClick(OnItemClicked onClick){
    this.onClick=onClick;
}

在MainActivity.java中 用适配器绑定item click

public class MainActivity extends Activity implements OnItemClicked {
 
    private RecyclerView mRecyclerView;
    private CityAdapter mAdapter;
    private List<City> cities;
 
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_city);

        mRecyclerView = (RecyclerView)findViewById(R.id.list);
        mRecyclerView.setLayoutManager(new LinearLayoutManager(this));
        
        mAdapter = new CityAdapter(cities, R.layout.row_city, this);
        mRecyclerView.setAdapter(mAdapter);
 
        mAdapter.setOnClick(MainActivity.this); // Bind the listener
    }
 
    @Override
    public void onItemClick(int position) {
    // The onClick implementation of the RecyclerView item click
    //ur intent code here
    }
}
11
投票

最简单的解决方案是访问holder类的“itemView”公共变量并在其上设置onClickListener。 

@Override
public void onBindViewHolder(ViewHolder holder, final int position) {
        holder.itemView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent = new Intent(context, NewActivity.class);
                intent.putExtra("FileName", list.get(position));
                context.startActivity(intent);
            }
        });        
}
1
投票

将适配器更改为此

    public class RecycleViewAdapter extends
        RecyclerView.Adapter<RecycleViewHolder> {// Recyclerview will extend to
    private List<FileName> fileNames;
    private Context context;
    private OnItemClicked listener;

    public RecycleViewAdapter(Context context, List<FileName> fileNames, OnItemClicked  listener) {
        this.context = context;
        this.fileNames = fileNames;
        this.listener = listener;
    }

    public BookingHistoryFragment() {
        // Required empty public constructor
    }

    @Override
    public RecycleViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        LayoutInflater mInflater = LayoutInflater.from(parent.getContext());

        ViewGroup mainGroup = (ViewGroup) mInflater.inflate(
                R.layout.grid_item, parent, false);
        RecycleViewHolder listHolder = new RecycleViewHolder(mainGroup);

        return listHolder;

    }

    @Override
    public void onBindViewHolder(RecycleViewHolder holder, final int position) {
        final FileName model = fileNames.get(position);
        RecycleViewHolder mainHolder = (RecycleViewHolder) holder;// holder
        mainHolder.title.setText(model.getName());
        mainHolder.note.setText(model.getShorttext());

        // Add click listener for root view
        view.getRootView().setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            listener.onItemClick(view, position)
        }
        });
    }

    @Override
    public int getItemCount() {
        return (null != fileNames ? fileNames.size() : 0);
    }

    public interface OnItemClicked {
        void onItemClick(View view, int position);
    }
}

现在在从活动或片段初始化时将 ItemClickInterface 传递给适配器构造函数。 而不是：

RecycleViewAdapter adapter = new RecycleViewAdapter(this, filenames);

使用这个：

RecycleViewAdapter adapter = new RecycleViewAdapter(this, filenames, new RecycleViewAdapter.OnItemClicked () {
@Override
      public void onItemClick(View view, Position position) {

      }
});
1
投票

首先将此类添加到您的包中

public class MyTouchListener implements RecyclerView.OnItemTouchListener {


/*Change these as per your need*/
private static final int SWIPE_MIN_DISTANCE = 120;
private static final int SWIPE_THRESHOLD_VELOCITY = 200;
private static final int SWIPE_MAX_OFF_PATH = 250;

private OnTouchActionListener mOnTouchActionListener;
private GestureDetectorCompat mGestureDetector;

public static interface OnTouchActionListener {
    public void onLeftSwipe(View view, int position);
    public void onRightSwipe(View view, int position);
    public void onClick(View view, int position);
}

public MyTouchListener(Context context, final RecyclerView recyclerView,
                             OnTouchActionListener onTouchActionListener){

    mOnTouchActionListener = onTouchActionListener;
    mGestureDetector = new GestureDetectorCompat(context,new GestureDetector.SimpleOnGestureListener(){

        @Override
        public boolean onSingleTapConfirmed(MotionEvent e) {
            // Find the item view that was swiped based on the coordinates
            View child = recyclerView.findChildViewUnder(e.getX(), e.getY());
            int childPosition = recyclerView.getChildPosition(child);
            mOnTouchActionListener.onClick(child, childPosition);
            return false;
        }

        @Override
        public boolean onFling(MotionEvent e1, MotionEvent e2,
                               float velocityX, float velocityY) {

            try {
                if (Math.abs(e1.getY() - e2.getY()) > SWIPE_MAX_OFF_PATH) {
                    return false;
                }

                // Find the item view that was swiped based on the coordinates
                View child = recyclerView.findChildViewUnder(e1.getX(), e1.getY());
                int childPosition = recyclerView.getChildPosition(child);

                // right to left swipe
                if (e1.getX() - e2.getX() > SWIPE_MIN_DISTANCE && Math.abs(velocityX) > SWIPE_THRESHOLD_VELOCITY) {

                    if (mOnTouchActionListener != null && child != null) {
                        mOnTouchActionListener.onLeftSwipe(child, childPosition);
                    }

                } else if (e2.getX() - e1.getX() > SWIPE_MIN_DISTANCE && Math.abs(velocityX) > SWIPE_THRESHOLD_VELOCITY) {
                    if (mOnTouchActionListener != null && child != null) {
                        mOnTouchActionListener.onRightSwipe(child, childPosition);
                    }
                }
            } catch (Exception e) {
                // nothing
            }

            return false;
        }
    });
}

@Override
public boolean onInterceptTouchEvent(RecyclerView rv, MotionEvent e) {
    mGestureDetector.onTouchEvent(e);
    return false;
}

@Override
public void onTouchEvent(RecyclerView rv, MotionEvent e) {
}

@Override
public void onRequestDisallowInterceptTouchEvent(boolean disallowIntercept) {
    // do nothing
}}

然后像这样添加OnItemTouchListener：

myRecyclerView.addOnItemTouchListener(new MyTouchListener(mContext,
            myRecyclerView,
            new MyTouchListener.OnTouchActionListener() {
                @Override
                public void onLeftSwipe(View view, int position) {//code as per your need
                }

                @Override
                public void onRightSwipe(View view, int position) {//code as per your need
                }

                @Override
                public void onClick(View view, int position) {//code as per your need
                }
            }));
0
投票

将此代码添加到您的

RecyclerView
适配器中

    private OnItemClicked mListener;

    public RecycleViewAdapter(Context context, OnItemClicked listener, List<FileName> fileNames) {
        //............//
        this.mListener = listener;
    }

    @Override
    public void onBindViewHolder(RecycleViewHolder holder, final int position) {
        //............//
        mainHolder.title.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                mListener.onItemClick(position);
            }
        });

    }

    public interface OnItemClicked {
        void onItemClick(int position);
    }

并将您的 Activity/Fragment 实现为 RecyclerViewAdapter.OnItemClicked

要通过 Intent 传递，您可以在 Activity/Fragment 中编写以下代码

    @Override
    public void onItemClick(int position) {
        Intent intent = new Intent(mContext, YourActivity.class);
        intent.putExtra(YourActivity.ARG_FILE, filnames.get(position));
        startActivity(intent);
    }
0
投票

所以，不确定是否有人感兴趣或者我的方法是否有问题，但我想出了一个更简单的方法供我个人使用。

商品的Xml：

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="?android:attr/listPreferredItemHeightLarge"
    android:background="@drawable/recycborder">


    <TextView
        android:id="@+id/recycText"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:gravity="center_vertical|center"
        android:onClick="recycClick"
        android:textColor="@color/black"
        android:textSize="16sp" />

</RelativeLayout>

在 onBindViewHolder 内部，将标签设置为您需要的任何信息。名称、位置、显示的文字、显示的图片等等。

@Override
    public void onBindViewHolder(ViewHolder holder, final int position) {
        holder.recycText.setText(lstAllInfo.get(position));
        holder.recycText.setTag(lstAllInfo.get(position));

    }

在您想要处理该项目的方法中，单击：

 public void recycClick(View v) {
        String test = v.getTag().toString();
        Toast.makeText(getApplicationContext(), ("You clicked: "  + test), Toast.LENGTH_LONG).show();
    }

我认为这有其局限性。标记可能无法保存您需要的数据，或者回收视图可能无法访问单击时的正确活动。就我个人而言，我将它用于 Android Wear，效果很好，所以我想发布以防万一，因为它比其他方法要少很多工作。

0
投票

将此代码尝试到您的持有者类中...... 它将工作并且易于使用：

public class RecyclerViewHolder extends RecyclerView.ViewHolder {

        public ItemHolder(@NonNull final View recyclerView) {
            super(recyclerView)

            recyclerView.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View view) {
                    int position = getAdapterPosition();

                }
            });
        }
    }
0
投票

在您的适配器类上创建一个接口。

public interface SelectedUser{

    void selectedUser(UserModel userModel);

}

在您的适配器视图持有者类中监听单击事件。

        itemView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                selectedUser.selectedUser(userModelList.get(getAdapterPosition()));
            }
        });

最终在您的活动中实现您的接口并覆盖该方法。

   @Override
    public void selectedUser(UserModel userModel) {

        startActivity(new Intent(MainActivity.this, SelectedUserActivity.class).putExtra("data",userModel));



    }

完整教程和源代码使用下面的链接。 带有点击监听器的Recyclerview

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