Question

我是Android开发人员的新手，正在尝试RecyclerView。我已经创建了NavigationDrawer一个片段，我正在尝试使用onSingleTap和onInterceptTouchEvent实现onClick和onLongPress。现在，我试着：

从单击启动一个活动，并显示onLongPress的Snackbar，但是当我LongPress时，它确实向我显示了Snackbar，但随后启动了为单击定义的活动。

package com.thenewboston.mynavigation;


import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.support.design.widget.Snackbar;
import android.support.v4.app.Fragment;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.view.GestureDetector;
import android.view.LayoutInflater;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewGroup;
import android.widget.RelativeLayout;



public class ToolFragment extends Fragment {


private RecyclerView recyclerView;
private RecyclerView.Adapter adapter;
private RecyclerView.LayoutManager layoutManager;
RelativeLayout tool_layout;


String[] country = {"Dog", "Car", "Donkey", "WTH", "Lion", "Cat", "Football", "abc", "bcd", "sdad", "srgs",
        "gkgkf", "dtfhfy", "Hyynw", "CBSE", "vtu"};


@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    // Inflate the layout for this fragment
    View rootView = inflater.inflate(R.layout.fragment_tool, container, false);

    recyclerView = (RecyclerView) rootView.findViewById(R.id.recycler_view);
    tool_layout = (RelativeLayout) rootView.findViewById(R.id.tool_layout);
    adapter = new RecyclerAdapter(country);
    layoutManager = new LinearLayoutManager(getActivity());
    recyclerView.setLayoutManager(layoutManager);
    recyclerView.setHasFixedSize(true);
    recyclerView.setAdapter(adapter);


    recyclerView.addOnItemTouchListener(new RecyclerTouchListener(getActivity(), recyclerView, new ClickListener() {
        @Override
        public void onmyClick(View view, int position) {
            Snackbar.make(view, "onClick " + position, Snackbar.LENGTH_SHORT)
                    .setAction("Action", null)
                    .show();
            Intent intent = new Intent(getContext(), InnerActivity.class);
            startActivity(intent);


        }

        @Override
        public void onmyLongClick(View view, int position) {
            Snackbar.make(view, "onLongPress " + position, Snackbar.LENGTH_SHORT)
                    .setAction("Action", null)
                    .show();

        }
    }));

    return rootView;

}


class RecyclerTouchListener implements RecyclerView.OnItemTouchListener {


    private GestureDetector gestureDetector;
    private ClickListener clickListener;    // initialise the clickListener in constructor


    public RecyclerTouchListener(Context context, final RecyclerView recyclerView, final ClickListener clickListener) {

        this.clickListener = clickListener;

        //Manually start gesture detector
        gestureDetector = new GestureDetector(context, new GestureDetector.SimpleOnGestureListener() {
            @Override
            public boolean onSingleTapUp(MotionEvent e) {
                return true;    //this has to be true
            }


            @Override
            public void onLongPress(MotionEvent e) {
                View child = recyclerView.findChildViewUnder(e.getX(), e.getY());
                if (child != null && clickListener != null) {
                    clickListener.onmyLongClick(child, recyclerView.getChildLayoutPosition(child));
                }
            }
        });

    }

    @Override
    public boolean onInterceptTouchEvent(RecyclerView rv, MotionEvent e) {
        gestureDetector.onTouchEvent(e);
        //single click method goes here
        View child = recyclerView.findChildViewUnder(e.getX(), e.getY());
        if (child != null && clickListener != null && gestureDetector.onTouchEvent(e)) {
            clickListener.onmyClick(child, rv.getChildLayoutPosition(child));
        }
        return false;


    }

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

    }

    @Override
    public void onRequestDisallowInterceptTouchEvent(boolean disallowIntercept) {

    }

}


public interface ClickListener {

    void onmyClick(View view, int position);

    void onmyLongClick(View view, int position);
}


}

Don't mind the Country names :)

Answer 1

我的猜测是因为你正在打电话

        clickListener.onmyClick(child, rv.getChildLayoutPosition(child));

in

public boolean onInterceptTouchEvent(RecyclerView rv, MotionEvent e) {

通过这样做，您将事件传递给手势监听器，并且每次都调用onmyClick方法。

基本上，无论其类型如何，您都会调用onmyClick每个动作事件。如果你想使用这条路线，你需要保留一些状态，以便跟踪运动事件，并了解它是一个简单的向下事件还是长按。

无法停止在onLongPress上启动活动

1 个答案: