滚动选择WheelView

来源：互联网发布：linux wine 运行 exe 编辑：程序博客网时间：2024/05/16 23:57

（自用，找来的源码没在csdn找到，自己贴了～方便找）

Wheelview

喵的这种大段的代码有没有好的方式上传啊～～新手求带

public class WheelView extends ScrollView {    public static final String TAG = WheelView.class.getSimpleName();    public static class OnWheelViewListener {        public void onSelected(int selectedIndex, String item) {        }    }    private Context context;//    private ScrollView scrollView;    private LinearLayout views;    public WheelView(Context context) {        super(context);        init(context);    }    public WheelView(Context context, AttributeSet attrs) {        super(context, attrs);        init(context);    }    public WheelView(Context context, AttributeSet attrs, int defStyle) {        super(context, attrs, defStyle);        init(context);    }    //    String[] items;    private List<String> items;    private List<String> getItems() {        return items;    }    public void setItems(List<String> list) {        if (null == items) {            items = new ArrayList<String>();        }        items.clear();        items.addAll(list);        // 前面和后面补全        for (int i = 0; i < offset; i++) {            items.add(0, "");            items.add("");        }        initData();    }    public static final int OFF_SET_DEFAULT = 1;    int offset = OFF_SET_DEFAULT; // 偏移量（需要在最前面和最后面补全）    public int getOffset() {        return offset;    }    public void setOffset(int offset) {        this.offset = offset;    }    int displayItemCount; // 每页显示的数量    int selectedIndex = 1;    private void init(Context context) {        this.context = context;//        scrollView = ((ScrollView)this.getParent());//        Log.d(TAG, "scrollview: " + scrollView);        Log.d(TAG, "parent: " + this.getParent());//        this.setOrientation(VERTICAL);        this.setVerticalScrollBarEnabled(false);        views = new LinearLayout(context);        views.setOrientation(LinearLayout.VERTICAL);        this.addView(views);        scrollerTask = new Runnable() {            public void run() {                int newY = getScrollY();                if (initialY - newY == 0) { // stopped                    final int remainder = initialY % itemHeight;                    final int divided = initialY / itemHeight;//                    Log.d(TAG, "initialY: " + initialY);//                    Log.d(TAG, "remainder: " + remainder + ", divided: " + divided);                    if (remainder == 0) {                        selectedIndex = divided + offset;                        onSeletedCallBack();                    } else {                        if (remainder > itemHeight / 2) {                            WheelView.this.post(new Runnable() {                                @Override                                public void run() {                                    WheelView.this.smoothScrollTo(0, initialY - remainder + itemHeight);                                    selectedIndex = divided + offset + 1;                                    onSeletedCallBack();                                }                            });                        } else {                            WheelView.this.post(new Runnable() {                                @Override                                public void run() {                                    WheelView.this.smoothScrollTo(0, initialY - remainder);                                    selectedIndex = divided + offset;                                    onSeletedCallBack();                                }                            });                        }                    }                } else {                    initialY = getScrollY();                    WheelView.this.postDelayed(scrollerTask, newCheck);                }            }        };    }    int initialY;    Runnable scrollerTask;    int newCheck = 50;    public void startScrollerTask() {        initialY = getScrollY();        this.postDelayed(scrollerTask, newCheck);    }    private void initData() {        views.removeAllViews();        displayItemCount = offset * 2 + 1;        for (String item : items) {            views.addView(createView(item));        }        refreshItemView(0);    }    int itemHeight = 0;    private TextView createView(String item) {        TextView tv = new TextView(context);        tv.setLayoutParams(new LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT));        tv.setSingleLine(true);        tv.setTextSize(TypedValue.COMPLEX_UNIT_SP, 20);        tv.setText(item);        tv.setTextColor(getResources().getColor(R.color.color_gray_cccccc));        tv.setGravity(Gravity.CENTER);        int padding = dip2px(15);        tv.setPadding(padding, padding, padding, padding);        if (0 == itemHeight) {            itemHeight = getViewMeasuredHeight(tv);            Log.d(TAG, "itemHeight: " + itemHeight);            views.setLayoutParams(new LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, itemHeight * displayItemCount));            LinearLayout.LayoutParams lp = (LinearLayout.LayoutParams) this.getLayoutParams();            this.setLayoutParams(new LinearLayout.LayoutParams(lp.width, itemHeight * displayItemCount));        }        return tv;    }    @Override    protected void onScrollChanged(int l, int t, int oldl, int oldt) {        super.onScrollChanged(l, t, oldl, oldt);//        Log.d(TAG, "l: " + l + ", t: " + t + ", oldl: " + oldl + ", oldt: " + oldt);//        try {//            Field field = ScrollView.class.getDeclaredField("mScroller");//            field.setAccessible(true);//            OverScroller mScroller = (OverScroller) field.get(this);//////            if(mScroller.isFinished()){//                Log.d(TAG, "isFinished...");//            }////        } catch (Exception e) {//            e.printStackTrace();//        }        refreshItemView(t);        if (t > oldt) {//            Log.d(TAG, "向下滚动");            scrollDirection = SCROLL_DIRECTION_DOWN;        } else {//            Log.d(TAG, "向上滚动");            scrollDirection = SCROLL_DIRECTION_UP;        }    }    private void refreshItemView(int y) {        int position = y / itemHeight + offset;        int remainder = y % itemHeight;        int divided = y / itemHeight;        if (remainder == 0) {            position = divided + offset;        } else {            if (remainder > itemHeight / 2) {                position = divided + offset + 1;            }        }        int childSize = views.getChildCount();        for (int i = 0; i < childSize; i++) {            TextView itemView = (TextView) views.getChildAt(i);            if (null == itemView) {                return;            }            if (position == i) {                itemView.setTextColor(getResources().getColor(R.color.color_36));            } else {                itemView.setTextColor(getResources().getColor(R.color.color_9));            }        }    }    /**     * 获取选中区域的边界     */    int[] selectedAreaBorder;    private int[] obtainSelectedAreaBorder() {        if (null == selectedAreaBorder) {            selectedAreaBorder = new int[2];            selectedAreaBorder[0] = itemHeight * offset;            selectedAreaBorder[1] = itemHeight * (offset + 1);        }        return selectedAreaBorder;    }    private int scrollDirection = -1;    private static final int SCROLL_DIRECTION_UP = 0;    private static final int SCROLL_DIRECTION_DOWN = 1;    Paint paint;    int viewWidth;    @Override    public void setBackgroundDrawable(Drawable background) {        if (viewWidth == 0) {            viewWidth = ((Activity) context).getWindowManager().getDefaultDisplay().getWidth();            Log.d(TAG, "viewWidth: " + viewWidth);        }        if (null == paint) {            paint = new Paint();            paint.setColor(getResources().getColor(R.color.c_f8f8f8));            paint.setStrokeWidth(dip2px(1f));        }        background = new Drawable() {            @Override            public void draw(Canvas canvas) {                canvas.drawLine(viewWidth * 1 / 6, obtainSelectedAreaBorder()[0], viewWidth * 5 / 6, obtainSelectedAreaBorder()[0], paint);                canvas.drawLine(viewWidth * 1 / 6, obtainSelectedAreaBorder()[1], viewWidth * 5 / 6, obtainSelectedAreaBorder()[1], paint);            }            @Override            public void setAlpha(int alpha) {            }            @Override            public void setColorFilter(ColorFilter cf) {            }            @Override            public int getOpacity() {                return 0;            }        };        super.setBackgroundDrawable(background);    }    @Override    protected void onSizeChanged(int w, int h, int oldw, int oldh) {        super.onSizeChanged(w, h, oldw, oldh);        Log.d(TAG, "w: " + w + ", h: " + h + ", oldw: " + oldw + ", oldh: " + oldh);        viewWidth = w;        setBackgroundDrawable(null);    }    /**     * 选中回调     */    private void onSeletedCallBack() {        if (null != onWheelViewListener) {            onWheelViewListener.onSelected(selectedIndex, items.get(selectedIndex));        }    }    public void setSeletion(int position) {        final int p = position;        selectedIndex = p + offset;        this.post(new Runnable() {            @Override            public void run() {                WheelView.this.smoothScrollTo(0, p * itemHeight);                refreshItemView(p * itemHeight);            }        });    }    public String getSeletedItem() {        return items.get(selectedIndex);    }    public int getSeletedIndex() {        return selectedIndex - offset;    }    @Override    public void fling(int velocityY) {        super.fling(velocityY / 3);    }    @Override    public boolean onTouchEvent(MotionEvent ev) {        if (ev.getAction() == MotionEvent.ACTION_UP) {            startScrollerTask();        }        return super.onTouchEvent(ev);    }    private OnWheelViewListener onWheelViewListener;    public OnWheelViewListener getOnWheelViewListener() {        return onWheelViewListener;    }    public void setOnWheelViewListener(OnWheelViewListener onWheelViewListener) {        this.onWheelViewListener = onWheelViewListener;    }    private int dip2px(float dpValue) {        final float scale = context.getResources().getDisplayMetrics().density;        return (int) (dpValue * scale + 0.5f);    }    private int getViewMeasuredHeight(View view) {        int width = View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED);        int expandSpec = View.MeasureSpec.makeMeasureSpec(Integer.MAX_VALUE >> 2, View.MeasureSpec.AT_MOST);        view.measure(width, expandSpec);        return view.getMeasuredHeight();    }}

根据String 的item 创建对应textview，加入scrollview，然后根据滚动获取getScrollY 进而计算框内对应的view。

嗯，注意offset和view的高度，以及调整createview的样式与重写的setBackgroundDrawable的样式，基本就可以得到你想要的了。

scrollerTask是选取与修正。不过感觉回调会相对频繁，建议操作完成之后，获取selectedIndex 进行处理。

像这样

sure = (TextView) view.findViewById(R.id.sure);        sure.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                if (listener != null) {                    listener.onConfirm(wheelView.getSeletedIndex());                }                dismiss();            }        });

话不多说，贴调用

  wheelView = (WheelView) view.findViewById(R.id.wheelview);        wheelView.setOffset(1);        wheelView.setOnWheelViewListener(new WheelView.OnWheelViewListener() {            @Override            public void onSelected(int selectedIndex, String item) {            }        }); wheelView.setItems(data); wheelView.setSeletion(index);

没了，data就是数据，setSeletion就是决定把哪个放中间～（out of bounds 的时候，注意纠结一下 offset 与下标。。。。。。不要问我为什么这么说）

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