Android 滑动 - 我应该使用手势监听器还是 MotionEvent.ACTION_MOVE？

Question

在 Recycler View 中左右滑动列表项时，两者中哪一个更适合使用？目前我的代码位于 MotionEvent.Action_move 中，我无法弄清楚很多事情。

1. 运动一点也不流畅。非常波涛汹涌。并且列表项总是在稍微延迟后开始移动。
2. 弄清楚我的手势是右手还是左手？

我正在查看 AndroidSwipeListView 的代码，他们似乎没有使用手势监听器。因此，我问。

Action_move 中执行移动的代码

               float posX = v.getX();
                float velocityX = Math.abs(velocityTracker.getXVelocity());

                float x = posX - event.getRawX();
                if (x < 0) {
                    posX += event.getRawX() / 100 + velocityX / 10;

                }
                else {
                    posX -= event.getRawX() / 100 + velocityX / 10;

                }
                v.animate().translationX(posX)
                        .alpha(0.8f);

使用更多代码进行第二次编辑:

public ViewHolder(final View itemView, int ViewType) {                 // Creating ViewHolder Constructor with View and viewType As a parameter
            super(itemView);

            //itemView.setOnClickListener(this);
            // Here we set the appropriate view in accordance with the the view type as passed when the holder object is created
            //itemView.setOnClickListener(this);
            itemView.setOnTouchListener(this);

            Name = (TextView) itemView.findViewById(R.id.avg_price);         // Creating Text View object from header.xml for name
            email = (TextView) itemView.findViewById(R.id.quantity);       // Creating Text View object from header.xml for email
            Holderid = 0;                                                // Setting holder id = 0 as the object being populated are of type header view



             swipeDetector = new GestureDetector(itemView.getContext(),
                    new GestureDetector.SimpleOnGestureListener() {
                        float x;
                        float y;

                        @Override
                        public boolean onDown(MotionEvent e) {
                            x = 0;
                            y = 0;
                            Log.d("onDown", "here");
                            return true;
                        }

                        @Override
                        public boolean onScroll(MotionEvent e1, MotionEvent e2,
                                                float distanceX, float distanceY) {
                            x -= distanceX;
                            y -= distanceY;
                            Log.d("scrolling", "here");
                            Log.d("view", itemView.toString());

                            //View view = itemView.findChildViewUnder(e.getX(), e.getY());
                            if (Math.abs(x) > Math.abs(y)) {
                                //Horizontal
                                if (x > 0) {

                                    //posX -= distanceX;
                                    Log.d("no", String.valueOf(distanceX));

                                    //itemView.animate().translationX(distanceX)
                                    //      .alpha(0.8f);
                                    //right
                                } else {
                                    //left
                                }
                            }
                            return true;
                        }
                    });


    }


        @Override
        public boolean onTouch(View v, MotionEvent event) {
             VelocityTracker velocityTracker = null;
            int index = event.getActionIndex();
            int action = event.getActionMasked();
            int pointerId = event.getPointerId(index);
            float downX = 0;
            float posX = v.getX();
            return swipeDetector.onTouchEvent(event);

Answer 1

GestureDetector 可以很容易地用于确定来自 MotionEvent 的滑动手势。

//Make a GestureDetector
swipeDetector = new GestureDetector(GLView.getContext(),
                new SimpleOnGestureListener() {
                    float x;
                    float y;
                    @Override
                    public boolean onDown (MotionEvent e){
                        x = 0;
                        y = 0;
                        return true;
                    }

                    @Override
                    public boolean onScroll(MotionEvent e1, MotionEvent e2,
                            float distanceX, float distanceY) {
                        x -= distanceX;
                        y -= distanceY;
                        if(Math.abs(x) > Math.abs(y)){
                            //Horizontal
                            if(x > 0){
                              //right
                            }else{
                              //left
                            }
                        }
                        return true;
                    }
                });



//Feed your MotionEvent to swipeDetector from your View
public boolean onTouchEvent(MotionEvent ev){ 
    return swipeDetector.onTouchEvent(ev);
}

下面是一个带有 GestureDetector 的示例 Adapter，您可能希望从中开始。

public class Adapter extends BaseAdapter {
    private int count = 50;

    @Override
    public int getCount() {
        return count;
    }

    @Override
    public Integer getItem(int position) {
        return Integer.valueOf(position);
    }

    @Override
    public long getItemId(int position) {
        return position;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        ViewHolder h;
        if (convertView == null) {
            convertView = View.inflate(parent.getContext(), R.layout.list_item, null);
            h = new ViewHolder(convertView);
            convertView.setTag(h);
        } else {
            h = (ViewHolder) convertView.getTag();
        }
        h.tv.setText("" + (position + 1));
        h.tv.setTranslationX(0);
        return convertView;
    }

    private static class ViewHolder implements View.OnTouchListener {
        View row;
        TextView tv;
        GestureDetector swipeDetector;

        ViewHolder(View convertView) {
            row = convertView;
            tv = (TextView) convertView.findViewById(R.id.tv);
            row.setOnTouchListener(this);
            swipeDetector = new GestureDetector(row.getContext(), new GestureDetector
                    .SimpleOnGestureListener() {
                float x;
                float y;

                @Override
                public boolean onDown(MotionEvent e) {
                    x = 0;
                    y = 0;
                    return true;
                }

                @Override
                public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX, float
                        distanceY) {
                    x -= distanceX;
                    y -= distanceY;
                    if (Math.abs(x) > Math.abs(y)) {
                        //Horizontal
                        if (x > 0) {
                            tv.setTranslationX(x);
                        } else {
                            //left
                        }
                    }
                    return true;
                }
            });
        }


        @Override
        public boolean onTouch(View v, MotionEvent event) {
            if (event.getAction() != MotionEvent.ACTION_CANCEL && event.getAction() !=
                    MotionEvent.ACTION_UP) {
                return swipeDetector.onTouchEvent(event);
            }
            tv.setTranslationX(0);
            return true;
        }
    }
}