Recyclerview長按項目選擇

Question

我有回收站視圖，我解析了jsonArray中的數據並將其顯示為lists.now，我想在我長單擊已編碼為長單擊的位置時突出顯示該行。如何突出顯示所選的行。請幫助我。

recyclerView.addOnItemTouchListener(new RecyclerTouchListener(getApplicationContext(), recyclerView, new ClickListener() {
                @Override
                public void onClick(View view, int position) {

                }

                @Override
                public void onLongClick(View view, int position) {
                    Toast.makeText(MainActivity.this, "long clicked", Toast.LENGTH_SHORT).show();

                }
            }));

Answer 1

在適配器中執行onBindViewHolder時，我將嘗試添加longClick listener 器 。

@Override
public void onBindViewHolder(E holder, int position) {
    holder.itemView.setOnLongClickListener(new View.OnLongClickListener() {
        @Override
        public boolean onLongClick(View v) {
            // Do your stuff
            return false;
        }
    });
}

Answer 2

嘗試這個。 在您的適配器中，在OnBindViewHolder方法下，如下所示：

 @Override public void onBindViewHolder(MyViewHolder holder, final int position) { holder.itemView.setOnLongClickListener(new View.OnLongClickListener() { @Override public boolean onLongClick(View v) { return false; //todo to highlight the row } }); } 

Answer 3

定義一個班級

public class RecyclerViewItemClickListener implements RecyclerView.OnItemTouchListener {

    //GestureDetector to detect touch event.
    private GestureDetector gestureDetector;
    private QueriesListFragment.ClickListener clickListener;

    public RecyclerViewItemClickListener(Context context, final RecyclerView recyclerView, final QueriesListFragment.ClickListener clickListener) {
        this.clickListener = clickListener;
        gestureDetector = new GestureDetector(context, new GestureDetector.SimpleOnGestureListener() {
            @Override
            public boolean onSingleTapUp(MotionEvent e) {
                return true;
            }

            @Override
            public void onLongPress(MotionEvent e) {
                //Find child on x and y position relative to screen
                View child = recyclerView.findChildViewUnder(e.getX(), e.getY());
                if (child != null && clickListener != null) {
                    clickListener.onLongClick(child, recyclerView.getChildLayoutPosition(child));
                }
            }
        });
    }

    @Override
    public boolean onInterceptTouchEvent(RecyclerView rv, MotionEvent e) {
        //On Touch event
        View child = rv.findChildViewUnder(e.getX(), e.getY());
        if (child != null && clickListener != null && gestureDetector.onTouchEvent(e)) {
            clickListener.onClick(child, rv.getChildLayoutPosition(child));
        }
        return false;
    }

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

    @Override
    public void onRequestDisallowInterceptTouchEvent(boolean disallowIntercept) {

    }
}

定義接口

public interface ClickListener {
    void onClick(View view, int position);

    void onLongClick(View view, int position);
}

將此分配給回收者視圖

myRecyclerView.addOnItemTouchListener(new RecyclerViewItemClickListener(getActivity(), mQueriesListRecyclerView, new ClickListener() {
        @Override
        public void onClick(View view, int position) {
            //triggers when click
        }

        @Override
        public void onLongClick(View view, int position) {
             //triggers when you long press
        }
    }));

Answer 4

在您的情況下，如果您將longClicked項的位置設置為int並將其自身設置為view ，則可以執行以下操作：

            recyclerView.addOnItemTouchListener(new 

                RecyclerTouchListener(getApplicationContext(), recyclerView, new ClickListener() {
                                @Override
                                public void onClick(View view, int position) {

                                }

                                @Override
                                public void onLongClick(View view, int position) {
                                    view.setTag("Selected"); 
                                    recyclerView.getAdapter().notifyItemChanged(position);
                                    return true;
                                }
                            }));

然后在RecyclerView.Adapter執行以下操作：

@Override
public void onBindViewHolder(YourViewHolderClass holder, int position) {
          if(holder.getTag().equals("Selected"){
                    //do highlight
                    //for example whit [RecyclerView.ItemDecoration][1]
                }else{
                    //remove highlight
                    //else is mandatory in order to prevent bugs when view is recycled
                }
    });
}