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GridView

編輯:關於Android編程

這裡寫圖片描述

public class DragGrid extends GridView {
    /** 點擊時候的X位置 */
    public int downX;
    /** 點擊時候的Y位置 */
    public int downY;
    /** 點擊時候對應整個界面的X位置 */
    public int windowX;
    /** 點擊時候對應整個界面的Y位置 */
    public int windowY;
    /** 屏幕上的X */
    private int win_view_x;
    /** 屏幕上的Y*/
    private int win_view_y;
    /** 拖動的裡x的距離  */
    int dragOffsetX;
    /** 拖動的裡Y的距離  */
    int dragOffsetY;
    /** 長按時候對應postion */
    public int dragPosition;
    /** Up後對應的ITEM的Position */
    private int dropPosition;
    /** 開始拖動的ITEM的Position*/
    private int startPosition;
    /** item高 */
    private int itemHeight;
    /** item寬 */
    private int itemWidth;
    /** 拖動的時候對應ITEM的VIEW */
    private View dragImageView = null;
    /** 長按的時候ITEM的VIEW*/
    private ViewGroup dragItemView = null;
    /** WindowManager管理器 */
    private WindowManager windowManager = null;
    /** */
    private WindowManager.LayoutParams windowParams = null;
    /** item總量*/
    private int itemTotalCount;
    /** 一行的ITEM數量*/
    private int nColumns = 4;
    /** 行數 */
    private int nRows;
    /** 剩余部分 */
    private int Remainder;
    /** 是否在移動 */
    private boolean isMoving = false;
    /** */
    private int holdPosition;
    /** 拖動的時候放大的倍數 */
    private double dragScale = 1.2D;
    /** 震動器  */
    private Vibrator mVibrator;
    /** 每個ITEM之間的水平間距 */
    private int mHorizontalSpacing = ViewUtil.dip2px(ContextUtil.getInstance(),16);
    /** 每個ITEM之間的豎直間距 */
    private int mVerticalSpacing = ViewUtil.dip2px(ContextUtil.getInstance(),14);
    /* 移動時候最後個動畫的ID */
    private String LastAnimationID;

    public DragGrid(Context context) {
        super(context);
        init(context);
    }

    public DragGrid(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
        init(context);
    }

    public DragGrid(Context context, AttributeSet attrs) {
        super(context, attrs);
        init(context);
    }

    public void init(Context context){
        mVibrator = (Vibrator) context.getSystemService(Context.VIBRATOR_SERVICE);
        //將布局文件中設置的間距dip轉為px
        mHorizontalSpacing = ViewUtil.dip2px(context, mHorizontalSpacing);
    }

    @Override
    public boolean onInterceptTouchEvent(MotionEvent ev) {
        // TODO Auto-generated method stub
        if (ev.getAction() == MotionEvent.ACTION_DOWN) {
            downX = (int) ev.getX();
            downY = (int) ev.getY();
            windowX = (int) ev.getX();
            windowY = (int) ev.getY();
            setOnItemClickListener(ev);
        }
        return super.onInterceptTouchEvent(ev);
    }

    @Override
    public boolean onTouchEvent(MotionEvent ev) {
        // TODO Auto-generated method stub
        boolean bool = true;
        if (dragImageView != null && dragPosition != AdapterView.INVALID_POSITION) {
            // 移動時候的對應x,y位置
            bool = super.onTouchEvent(ev);
            int x = (int) ev.getX();
            int y = (int) ev.getY();
            switch (ev.getAction()) {
            case MotionEvent.ACTION_DOWN:
                downX = (int) ev.getX();
                windowX = (int) ev.getX();
                downY = (int) ev.getY();
                windowY = (int) ev.getY();
                break;
            case MotionEvent.ACTION_MOVE:
                onDrag(x, y ,(int) ev.getRawX() , (int) ev.getRawY());
                if (!isMoving){
                    OnMove(x, y);
                }
                if (pointToPosition(x, y) != AdapterView.INVALID_POSITION){
                    break;
                }
                break;
            case MotionEvent.ACTION_UP:
                stopDrag();
                onDrop(x, y);
                requestDisallowInterceptTouchEvent(false);
                break;

            default:
                break;
            }
        }
        return super.onTouchEvent(ev);
    }

    /** 在拖動的情況 */
    private void onDrag(int x, int y , int rawx , int rawy) {
        if (dragImageView != null) {
            windowParams.alpha = 0.6f;
//          windowParams.x = x - win_view_x + viewX;
//          windowParams.y = y +  win_view_y + viewY;
//          windowParams.x = rawx - itemWidth / 2;
//          windowParams.y = rawy - itemHeight / 2;
            windowParams.x = rawx - win_view_x;
            windowParams.y = rawy - win_view_y;
            windowManager.updateViewLayout(dragImageView, windowParams);
        }
    }

    /** 在松手下放的情況 */
    private void onDrop(int x, int y) {
        // 根據拖動到的x,y坐標獲取拖動位置下方的ITEM對應的POSTION
        int tempPostion = pointToPosition(x, y);
//      if (tempPostion != AdapterView.INVALID_POSITION) {
            dropPosition = tempPostion;
            DragAdapter mDragAdapter = (DragAdapter) getAdapter();
            //顯示剛拖動的ITEM
            mDragAdapter.setShowDropItem(true);
            //刷新適配器,讓對應的ITEM顯示
            mDragAdapter.notifyDataSetChanged();
//      }
    }
    /**
     * 長按點擊監聽
     * @param ev
     */
    public void setOnItemClickListener(final MotionEvent ev) {
        setOnItemLongClickListener(new OnItemLongClickListener() {

            @Override
            public boolean onItemLongClick(AdapterView parent, View view,
                    int position, long id) {
                int x = (int) ev.getX();// 長安事件的X位置
                int y = (int) ev.getY();// 長安事件的y位置

                startPosition = position;// 第一次點擊的postion
                dragPosition = position;
//              if (startPosition <= 1) {
//                  return false;
//              }
                ViewGroup dragViewGroup = (ViewGroup) getChildAt(dragPosition - getFirstVisiblePosition());
                TextView dragTextView = (TextView)dragViewGroup.findViewById(R.id.text_item);
                dragTextView.setSelected(true);
                dragTextView.setEnabled(false);
                itemHeight = dragViewGroup.getHeight();
                itemWidth = dragViewGroup.getWidth();
                itemTotalCount = DragGrid.this.getCount();
                int row = itemTotalCount / nColumns;// 算出行數
                Remainder = (itemTotalCount % nColumns);// 算出最後一行多余的數量
                if (Remainder != 0) {
                    nRows = row + 1;
                } else {
                    nRows = row;
                }
                // 如果特殊的這個不等於拖動的那個,並且不等於-1
                if (dragPosition != AdapterView.INVALID_POSITION) {
                    // 釋放的資源使用的繪圖緩存。如果你調用buildDrawingCache()手動沒有調用setDrawingCacheEnabled(真正的),你應該清理緩存使用這種方法。
                    win_view_x = windowX - dragViewGroup.getLeft();//VIEW相對自己的X,半斤
                    win_view_y = windowY - dragViewGroup.getTop();//VIEW相對自己的y,半斤
                    dragOffsetX = (int) (ev.getRawX() - x);//手指在屏幕的上X位置-手指在控件中的位置就是距離最左邊的距離
                    dragOffsetY = (int) (ev.getRawY() - y);//手指在屏幕的上y位置-手指在控件中的位置就是距離最上邊的距離
                    dragItemView = dragViewGroup;
                    dragViewGroup.destroyDrawingCache();
                    dragViewGroup.setDrawingCacheEnabled(true);
                    Bitmap dragBitmap = Bitmap.createBitmap(dragViewGroup.getDrawingCache());
                    mVibrator.vibrate(50);//設置震動時間
                    startDrag(dragBitmap, (int)ev.getRawX(),  (int)ev.getRawY());
                    hideDropItem();
                    dragViewGroup.setVisibility(View.INVISIBLE);
                    isMoving = false;
                    requestDisallowInterceptTouchEvent(true);
                    return true;
                }
                return false;
            }
        });
    }

    public void startDrag(Bitmap dragBitmap, int x, int y) {
        stopDrag();
        windowParams = new WindowManager.LayoutParams();// 獲取WINDOW界面的
        //Gravity.TOP|Gravity.LEFT;這個必須加  
        windowParams.gravity = Gravity.TOP | Gravity.LEFT;
        // 計算當前項Left離窗體的距離
//      windowParams.x = x - (int)((itemWidth / 2) * dragScale);
//      windowParams.y = y - (int) ((itemHeight / 2) * dragScale);
        //得到preview左上角相對於屏幕的坐標   
        windowParams.x = x - win_view_x;
        windowParams.y = y  - win_view_y; 
//      this.windowParams.x = (x - this.win_view_x + this.viewX);//位置的x值
//      this.windowParams.y = (y - this.win_view_y + this.viewY);//位置的y值
        //設置拖拽item的寬和高  
        windowParams.width = (int) (dragScale * dragBitmap.getWidth());// 放大dragScale倍,可以設置拖動後的倍數
        windowParams.height = (int) (dragScale * dragBitmap.getHeight());// 放大dragScale倍,可以設置拖動後的倍數
        this.windowParams.flags = WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE                           
                | WindowManager.LayoutParams.FLAG_NOT_TOUCHABLE                           
                | WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON                           
                | WindowManager.LayoutParams.FLAG_LAYOUT_IN_SCREEN;
        this.windowParams.format = PixelFormat.TRANSLUCENT;
        this.windowParams.windowAnimations = 0;
        ImageView iv = new ImageView(getContext());
        iv.setImageBitmap(dragBitmap);
        windowManager = (WindowManager) getContext().getSystemService(Context.WINDOW_SERVICE);// "window"
        windowManager.addView(iv, windowParams);
        dragImageView = iv;
    }

    /** 停止拖動 ,釋放並初始化 */
    private void stopDrag() {
        if (dragImageView != null) {
            windowManager.removeView(dragImageView);
            dragImageView = null;
        }
    }

    /** 在ScrollView內,所以要進行計算高度 */
    @Override
    public void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        int expandSpec = MeasureSpec.makeMeasureSpec(Integer.MAX_VALUE >> 2,MeasureSpec.AT_MOST);
        super.onMeasure(widthMeasureSpec, expandSpec);
    }

    /** 隱藏 放下 的ITEM*/
    private void hideDropItem() {
        ((DragAdapter) getAdapter()).setShowDropItem(false);
    }

    /** 獲取移動動畫 */
    public Animation getMoveAnimation(float toXValue, float toYValue) {
        TranslateAnimation mTranslateAnimation = new TranslateAnimation(
                Animation.RELATIVE_TO_SELF, 0.0F,
                Animation.RELATIVE_TO_SELF,toXValue, 
                Animation.RELATIVE_TO_SELF, 0.0F,
                Animation.RELATIVE_TO_SELF, toYValue);// 當前位置移動到指定位置
        mTranslateAnimation.setFillAfter(true);// 設置一個動畫效果執行完畢後,View對象保留在終止的位置。
        mTranslateAnimation.setDuration(300L);
        return mTranslateAnimation;
    }

    /** 移動的時候觸發*/
    public void OnMove(int x, int y) {
        // 拖動的VIEW下方的POSTION
        int dPosition = pointToPosition(x, y);
        // 判斷下方的POSTION是否是最開始2個不能拖動的
        if (dPosition >=0) {
            if ((dPosition == -1) || (dPosition == dragPosition)){
                return;
            }
            dropPosition = dPosition;
            if (dragPosition != startPosition){
                dragPosition = startPosition;
            }
            int movecount;
            //拖動的=開始拖的,並且 拖動的 不等於放下的
            if ((dragPosition == startPosition) || (dragPosition != dropPosition)){
                //移需要移動的動ITEM數量
                movecount = dropPosition - dragPosition;
            }else{
                //移需要移動的動ITEM數量為0
                movecount = 0;
            }
            if(movecount == 0){
                return;
            }

            int movecount_abs = Math.abs(movecount);

            if (dPosition != dragPosition) {
                //dragGroup設置為不可見
                ViewGroup dragGroup = (ViewGroup) getChildAt(dragPosition);
                dragGroup.setVisibility(View.INVISIBLE);

                float to_x = 1;// 當前下方positon
                float to_y;// 當前下方右邊positon
                //x_vlaue移動的距離百分比(相對於自己長度的百分比)
                float x_vlaue = ((float) mHorizontalSpacing / (float) itemWidth) + 1.0f;
                //y_vlaue移動的距離百分比(相對於自己寬度的百分比)
                float y_vlaue = ((float) mVerticalSpacing / (float) itemHeight) + 1.0f;
                Log.d("x_vlaue", "x_vlaue = " + x_vlaue);
                for (int i = 0; i < movecount_abs; i++) {
                     to_x = x_vlaue;
                     to_y = y_vlaue;
                    //像左
                    if (movecount > 0) {
                        // 判斷是不是同一行的
                        holdPosition = dragPosition + i + 1;
                        if (dragPosition / nColumns == holdPosition / nColumns) {
                            to_x = - x_vlaue;
                            to_y = 0;
                        } else if (holdPosition % 4 == 0) {
                            to_x = 3 * x_vlaue;
                            to_y = - y_vlaue;
                        } else {
                            to_x = - x_vlaue;
                            to_y = 0;
                        }
                    }else{
                        //向右,下移到上,右移到左
                        holdPosition = dragPosition - i - 1;
                        if (dragPosition / nColumns == holdPosition / nColumns) {
                            to_x = x_vlaue;
                            to_y = 0;
                        } else if((holdPosition + 1) % 4 == 0){
                            to_x = -3 * x_vlaue;
                            to_y = y_vlaue;
                        }else{
                            to_x = x_vlaue;
                            to_y = 0;
                        }
                    }
                    ViewGroup moveViewGroup = (ViewGroup) getChildAt(holdPosition);
                    Animation moveAnimation = getMoveAnimation(to_x, to_y);
                    moveViewGroup.startAnimation(moveAnimation);
                    //如果是最後一個移動的,那麼設置他的最後個動畫ID為LastAnimationID
                    if (holdPosition == dropPosition) {
                        LastAnimationID = moveAnimation.toString();
                    }
                    moveAnimation.setAnimationListener(new AnimationListener() {

                        @Override
                        public void onAnimationStart(Animation animation) {
                            // TODO Auto-generated method stub
                            isMoving = true;
                        }

                        @Override
                        public void onAnimationRepeat(Animation animation) {
                            // TODO Auto-generated method stub

                        }

                        @Override
                        public void onAnimationEnd(Animation animation) {
                            // TODO Auto-generated method stub
                            // 如果為最後個動畫結束,那執行下面的方法
                            if (animation.toString().equalsIgnoreCase(LastAnimationID)) {
                                DragAdapter mDragAdapter = (DragAdapter) getAdapter();
                                mDragAdapter.exchange(startPosition,dropPosition);
                                startPosition = dropPosition;
                                dragPosition = dropPosition;
                                isMoving = false;
                            }
                        }
                    });
                }
            }
        }
    }
}

這裡寫圖片描述

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