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我想刷一个项目ExpandablelistView并将其推到屏幕外。我现在可以这样做，但是当我的滑动手势结束时执行此操作，我希望它在您滑动电子邮件时像 gmail 新应用程序一样准确地用我的手指移动。（我也希望随着翻译的增加透明度）你能帮我提供一些建议或教程链接吗？

我有一个扩展的适配器BaseExpandableAdapter，一个用于检测滑动手势的类和一个mainActivity

MainActivity 类

public class MainActivity extends Activity implements OnScrollListener{
    ExpandableListView lv1;
    private CustomListAdapter cla;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        lv1 = (ExpandableListView) findViewById(R.id.list);
        final SwipeDetector swipeDetector = new SwipeDetector();
        lv1.setOnTouchListener(swipeDetector);
        cla = new CustomListAdapter(this);
        addData();
        lv1.setAdapter(cla);
        lv1.setOnScrollListener(this);
        lv1.setOnChildClickListener(new OnChildClickListener() {
            @Override
            public boolean onChildClick(ExpandableListView parent, View v,
                    int groupPosition, int childPosition, long id) {
                Object o = cla.getGroup(groupPosition);
                MatchResult m =((trnmSeparator) o).getMatches().get(childPosition);
                //int type = (Integer) rowType.get(position);
                if (swipeDetector.swipeDetected()){
                    // do the onSwipe action
                    //Toast.makeText(MainActivity.this, "SWIPE :" + " " + m , Toast.LENGTH_SHORT).show();
                    float dest = 0;
                    v = v.findViewById(R.id.match);
                    float place = v.getX();
                    if (swipeDetector.getAction() == Action.LR){
                        if (place == 0) dest =  v.getWidth();
                        else if (place > 0) dest = v.getWidth();
                        else if (place < 0) dest = 0;
                    } 
                    else if (swipeDetector.getAction() == Action.RL){
                        if (place == 0) dest =  -v.getWidth();
                        else if (place > 0) dest = 0;
                        else if (place < 0) dest = -v.getWidth();
                    } 
                    ObjectAnimator oa = ObjectAnimator.ofFloat(v, "x", dest);
                    oa.setDuration(700);
                    oa.start();
                    Log.v("view type", v.toString());
                    return false;
                } else {
                    // do the onItemClick action
                    Toast.makeText(MainActivity.this, "Selected :" + " " + m, Toast.LENGTH_SHORT).show();
                    return true;
                }
            }
        });

        lv1.setOnGroupClickListener(new OnGroupClickListener() {

            @Override
            public boolean onGroupClick(ExpandableListView parent, View v,
                    int groupPosition, long id) {
                if (swipeDetector.swipeDetected()){
                    // do the onSwipe action
                    Object o = lv1.getItemAtPosition(groupPosition);
                    Toast.makeText(MainActivity.this, "SWIPE :" + " " + o , Toast.LENGTH_SHORT).show();
                    return true;
                }
                if (lv1.isGroupExpanded(groupPosition)){
                    Object o = cla.getGroup(groupPosition);
                    Log.v("type", o.getClass().toString());
                    for (int i = 0; i < ((trnmSeparator) o).getMatches().size(); i++){
                        lv1.getChildAt(i).setX(0f);
                    }
                }
                return false;
            }
        });

        lv1.setOnItemLongClickListener(new OnItemLongClickListener() {
            @Override
            public boolean onItemLongClick(AdapterView<?> arg0, View arg1,
                    int arg2, long arg3) {
                Toast.makeText(MainActivity.this, "Long Press" + lv1.getItemAtPosition(arg2), Toast.LENGTH_SHORT).show();
                return false;
            }
        });
    }

    @Override
    public void onScroll(AbsListView view, int firstVisibleItem,
            int visibleItemCount, int totalItemCount) {
        // TODO Auto-generated method stub
        boolean loadMore = firstVisibleItem + visibleItemCount >= totalItemCount;  //maybe add a padding 
        if(loadMore) {
            addData();
            //cla.count += visibleItemCount; // or any other amount
            cla.notifyDataSetChanged();
        }
    }
}

和我的刷卡探测器

package com.example.jadidtar;

import android.util.Log;
import android.view.MotionEvent;
import android.view.View;

public class SwipeDetector implements View.OnTouchListener {
    public static enum Action {
        LR, // Left to Right
        RL, // Right to Left
        None // when no action was detected
    }

    private static final String logTag = "SwipeDetector";
    private static final int HORIZONTAL_MIN_DISTANCE = 100;
    private float downX, downY, upX, upY;
    private Action mSwipeDetected = Action.None;

    public boolean swipeDetected() {
        return mSwipeDetected != Action.None;
    }

    public Action getAction() {
        return mSwipeDetected;
    }

    public boolean onTouch(View v, MotionEvent event) {
        switch (event.getAction()) {
            case MotionEvent.ACTION_DOWN: {
                downX = event.getX();
                downY = event.getY();
                mSwipeDetected = Action.None;
                return false; // allow other events like Click to be processed
            }
            case MotionEvent.ACTION_MOVE: {
                upX = event.getX();
                upY = event.getY();

                float deltaX = downX - upX;
                float deltaY = downY - upY;

                // horizontal swipe detection
                if (Math.abs(deltaX) > HORIZONTAL_MIN_DISTANCE) {
                    // left or right
                    if (deltaX < 0) {
                        mSwipeDetected = Action.LR;
                        return true;
                    }
                    if (deltaX > 0) {
                        mSwipeDetected = Action.RL;
                        return true;
                    }
                } 
                return false;
            }
        }
        return false;
    }
}
4

1 回答 1

0

这是我用来做你想做的事情的一部分代码。它onTouchListner在（linearLayout）对象上使用（这是我的列表视图行）：

VelocityTracker _VelocityTracker;
int _slop; 

ViewConfiguration vc = ViewConfiguration.get(context);
_slop = vc.getScaledTouchSlop();

 [.........code ......]

_dividerRow.setOnTouchListener(new MyGestureListener()
                );


class MyGestureListener implements OnTouchListener{
        private PointF _init;
        @Override
        public boolean onTouch(View v, MotionEvent event) {

            switch(event.getAction())
            {
            case MotionEvent.ACTION_DOWN :
                _init = new PointF(event.getRawX(), event.getRawY());
                if(!(v == null))
                {
                    _VelocityTracker = VelocityTracker.obtain();
                    _VelocityTracker.addMovement(event);
                }

                break;

            case MotionEvent.ACTION_UP :
                break;

            case MotionEvent.ACTION_MOVE :
                if(event.getX() > 0)
                {
                        _VelocityTracker.addMovement(event);
                        float diffX = event.getRawX() - _init.x;
                        float diffY = event.getRawY() - _init.y;

                        if (Math.abs(diffX) > _slop && Math.abs(diffX) > Math.abs(diffY)) {
                            _swipping = true;
                            ((ViewGroup) v).requestDisallowInterceptTouchEvent(true);

                            MotionEvent cancelEvent = MotionEvent.obtain(event);
                            cancelEvent.setAction(MotionEvent.ACTION_CANCEL | (event.getActionIndex() << MotionEvent.ACTION_POINTER_INDEX_SHIFT));
                            v.onTouchEvent(cancelEvent);
                        } 

                        if(_swipping == true)
                        {

                            ViewHelper.setTranslationX(v, diffX);
                        }
                    }

                break;
            }
            return false;
        }
    }

希望能帮助到你

于 2013-07-11T12:23:16.223 回答