曾经项目需求,要实现一个类似以前ZAKER新闻阅读的DragGridView特效。不过,没要求实现横向跨屏,而是竖向跨屏。网上资源也很多,有实现横向跨屏的,可是没有找到竖向的。后来只好结合人家代码,修改一二。
贴代码!
/** * @blog http://blog.csdn.net/xiaanming * * @author xiaanming&&wangxuanao * */ public class DragGridView extends GridView { /** * DragGridView的item长按响应的时间, 默认是1000毫秒,也可以自行设置。目前没有用到延迟。 */ private long dragResponseMS = 1000; /** * 是否可以拖拽,默认不可以 */ private boolean isDrag = false; private int mDownX; private int mDownY; private int moveX; private int moveY; private int nColumns = 2; /** * 是否计算状态栏的高度在内,涉及到镜像的起始位置y */ private boolean isContainStatusHeight = false; private boolean isMoving = false; /** * 正在拖拽的position */ private int mDragPosition; /** * 刚开始拖拽的item对应的View */ private View mStartDragItemView = null; /** * 用于拖拽的镜像,这里直接用一个ImageView */ private ImageView mDragImageView; /** * 震动器 */ private Vibrator mVibrator; private WindowManager mWindowManager; /** * item镜像的布局参数 */ private WindowManager.LayoutParams mWindowLayoutParams; /** * 我们拖拽的item对应的Bitmap */ private Bitmap mDragBitmap; /** * 按下的点到所在item的上边缘的距离 */ private int mPoint2ItemTop; /** * 按下的点到所在item的左边缘的距离 */ private int mPoint2ItemLeft; /** * DragGridView距离屏幕顶部的偏移量 */ private int mOffset2Top; /** * DragGridView距离屏幕左边的偏移量 */ private int mOffset2Left; /** * 状态栏的高度 */ private int mStatusHeight; /** * DragGridView自动向下滚动的边界值 */ private int mDownScrollBorder; /** * DragGridView自动向上滚动的边界值 */ private int mUpScrollBorder; /** * DragGridView自动滚动的速度 */ private static final int speed = 20; public DragGridView(Context context) { this(context, null); } public DragGridView(Context context, AttributeSet attrs) { this(context, attrs, 0); } public DragGridView(Context context, AttributeSet attrs, int defStyle) { super(context, attrs, defStyle); mVibrator = (Vibrator) context .getSystemService(Context.VIBRATOR_SERVICE); mWindowManager = (WindowManager) context .getSystemService(Context.WINDOW_SERVICE); mStatusHeight = getStatusHeight(context); // 获取状态栏的高度 } private Handler mHandler = new Handler(); // 用来处理是否为长按的Runnable private Runnable mLongClickRunnable = new Runnable() { @Override public void run() { isDrag = true; // 设置可以拖拽 isMoving = false; mVibrator.vibrate(50); // 震动一下 mStartDragItemView.setVisibility(View.INVISIBLE);// 隐藏该item // 根据我们按下的点显示item镜像 createDragImage(mDragBitmap, mDownX, mDownY); } }; /** * 设置响应拖拽的毫秒数,默认是1000毫秒 * * @param dragResponseMS */ public void setDragResponseMS(long dragResponseMS) { this.dragResponseMS = dragResponseMS; } /** * 长按检测事件 * * @author wangxuanao */ public boolean setOnItemLongClickListener(final MotionEvent ev) { this.setOnItemLongClickListener(new AdapterView.OnItemLongClickListener() { @Override public boolean onItemLongClick(AdapterView<?> arg0, View arg1, int arg2, long arg3) { // arg2和arg3一直是相等的。及点击的item的position Log.e("LOG", "int arg2=" + arg2 + " long arg3=" + arg3); mDownX = (int) ev.getX(); mDownY = (int) ev.getY(); // 获取所点击item的position mDragPosition = arg2; if (mDragPosition == AdapterView.INVALID_POSITION) { Log.e("tag====onItemLongClick", "INVALID_POSITION"); return true; } // 根据position获取该item所对应的View mStartDragItemView = getChildAt(mDragPosition - getFirstVisiblePosition()); // 下面这几个距离大家可以参考我的博客上面的图来理解下 mPoint2ItemTop = mDownY - mStartDragItemView.getTop(); mPoint2ItemLeft = mDownX - mStartDragItemView.getLeft(); mOffset2Top = (int) (ev.getRawY() - mDownY); mOffset2Left = (int) (ev.getRawX() - mDownX); // 获取DragGridView自动向上滚动的偏移量,小于这个值,DragGridView向下滚动 mDownScrollBorder = getHeight() / 4; // 获取DragGridView自动向下滚动的偏移量,大于这个值,DragGridView向上滚动 mUpScrollBorder = getHeight() * 3 / 4; // 开启mDragItemView绘图缓存 mStartDragItemView.setDrawingCacheEnabled(true); // 获取mDragItemView在缓存中的Bitmap对象 mDragBitmap = Bitmap.createBitmap(mStartDragItemView .getDrawingCache()); // 这一步很关键,释放绘图缓存,避免出现重复的镜像 mStartDragItemView.destroyDrawingCache(); // 使用Handler延迟dragResponseMS执行mLongClickRunnable // mHandler.postDelayed(mLongClickRunnable, dragResponseMS); // 不延迟加载 mHandler.post(mLongClickRunnable); return false; } }); return super.onInterceptTouchEvent(ev); } @Override public boolean onInterceptTouchEvent(MotionEvent ev) { if (ev.getAction() == MotionEvent.ACTION_DOWN) { return setOnItemLongClickListener(ev); } return super.onInterceptTouchEvent(ev); } @Override public boolean onTouchEvent(MotionEvent ev) { // Log.e("LOG", "=========onTouchEvent======="); if (isDrag && mDragImageView != null) { switch (ev.getAction()) { case MotionEvent.ACTION_MOVE: moveX = (int) ev.getX(); moveY = (int) ev.getY(); // 拖动item onDragItem(moveX, moveY); break; case MotionEvent.ACTION_UP: onStopDrag(); isDrag = false; mHandler.removeCallbacks(mLongClickRunnable); // 线程结束 mHandler.removeCallbacks(mScrollRunnable); break; } return true; } return super.onTouchEvent(ev); } /** * 创建拖动的镜像 * * @param bitmap * @param downX * 按下的点相对父控件的X坐标 * @param downY * 按下的点相对父控件的X坐标 */ private void createDragImage(Bitmap bitmap, int downX, int downY) { DragAdapter adapter = (DragAdapter) this.getAdapter(); adapter.showDropItem(false); mWindowLayoutParams = new WindowManager.LayoutParams(); mWindowLayoutParams.format = PixelFormat.TRANSLUCENT; // 图片之外的其他地方透明 mWindowLayoutParams.gravity = Gravity.TOP | Gravity.LEFT; mWindowLayoutParams.x = downX - mPoint2ItemLeft + mOffset2Left; if (isContainStatusHeight) { mWindowLayoutParams.y = downY - mPoint2ItemTop + mOffset2Top - mStatusHeight; // 状态栏高度 可选 } else { mWindowLayoutParams.y = downY - mPoint2ItemTop + mOffset2Top; } Log.e("tag", "mWindowLayoutParams x=" + mWindowLayoutParams.x + " y=" + mWindowLayoutParams.y); mWindowLayoutParams.alpha = 0.55f; // 透明度 mWindowLayoutParams.width = WindowManager.LayoutParams.WRAP_CONTENT; mWindowLayoutParams.height = WindowManager.LayoutParams.WRAP_CONTENT; mWindowLayoutParams.flags = WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE | WindowManager.LayoutParams.FLAG_NOT_TOUCHABLE; mDragImageView = new ImageView(getContext()); mDragImageView.setImageBitmap(bitmap); mWindowManager.addView(mDragImageView, mWindowLayoutParams); } /** * 从界面上面移动拖动镜像 */ private void removeDragImage() { if (mDragImageView != null) { mWindowManager.removeView(mDragImageView); mDragImageView = null; } } /** * 拖动item,在里面实现了item镜像的位置更新,item的相互交换以及GridView的自行滚动 * * @param x * @param y */ private void onDragItem(int moveX, int moveY) { mWindowLayoutParams.x = moveX - mPoint2ItemLeft + mOffset2Left; if (isContainStatusHeight) { mWindowLayoutParams.y = moveY - mPoint2ItemTop + mOffset2Top - mStatusHeight;// 状态栏高度 可选 } else { mWindowLayoutParams.y = moveY - mPoint2ItemTop + mOffset2Top; } mWindowManager.updateViewLayout(mDragImageView, mWindowLayoutParams); // 更新镜像的位置 onSwapItem(moveX, moveY); // GridView自动滚动 mHandler.post(mScrollRunnable); } /** * 当moveY的值大于向上滚动的边界值,触发GridView自动向上滚动 当moveY的值小于向下滚动的边界值,触犯GridView自动向下滚动 * 否则不进行滚动 */ private Runnable mScrollRunnable = new Runnable() { @Override public void run() { int scrollY; if (moveY > mUpScrollBorder) { scrollY = speed; mHandler.postDelayed(mScrollRunnable, 25); } else if (moveY < mDownScrollBorder) { scrollY = -speed; mHandler.postDelayed(mScrollRunnable, 25); } else { scrollY = 0; mHandler.removeCallbacks(mScrollRunnable); } // 当我们的手指到达GridView向上或者向下滚动的偏移量的时候,可能我们手指没有移动,但是DragGridView在自动的滚动 // 所以我们在这里调用下onSwapItem()方法来交换item onSwapItem(moveX, moveY); smoothScrollBy(scrollY, 10); } }; /** * 交换item,并且控制item之间的显示与隐藏效果 * * @param moveX * @param moveY */ private void onSwapItem(int moveX, int moveY) { // 获取我们手指移动到的那个item的position final int tempPosition = pointToPosition(moveX, moveY); // 假如tempPosition 改变了并且tempPosition不等于-1,则进行交换 if (tempPosition != mDragPosition && tempPosition != AdapterView.INVALID_POSITION) { // getChildAt(tempPosition - // getFirstVisiblePosition()).setVisibility( // View.INVISIBLE);// 拖动到了新的item,新的item隐藏掉 // // getChildAt(mDragPosition - getFirstVisiblePosition()) // .setVisibility(View.VISIBLE);// 之前的item显示出来 if (!isMoving) { final int dropPosition = tempPosition - getFirstVisiblePosition(); int dragPosition = mDragPosition - getFirstVisiblePosition(); final int startPosition = mDragPosition; final int endPosition = tempPosition; Log.e("log", "tempPosition===" + tempPosition + " dropPosition===" + dropPosition + " dragPosition===" + dragPosition); int MoveNum = dropPosition - dragPosition; int holdPosition; if (dragPosition == dropPosition) MoveNum = 0; if (MoveNum != 0) { int itemMoveNum = Math.abs(MoveNum); float Xoffset, Yoffset; Log.e("log", "itemMoveNum===" + itemMoveNum); for (int i = 0; i < itemMoveNum; i++) { Log.e("log", "i===" + i); if (MoveNum > 0) { holdPosition = dragPosition + 1; Xoffset = (dragPosition / nColumns == holdPosition / nColumns) ? (-1) : (nColumns - 1); Yoffset = (dragPosition / nColumns == holdPosition / nColumns) ? 0 : (-1); } else { holdPosition = dragPosition - 1; Xoffset = (dragPosition / nColumns == holdPosition / nColumns) ? 1 : (-(nColumns - 1)); Yoffset = (dragPosition / nColumns == holdPosition / nColumns) ? 0 : 1; } ViewGroup moveView = (ViewGroup) getChildAt(holdPosition); Log.e("log", "holdPosition===" + holdPosition); Animation animation = getMoveAnimation(Xoffset, Yoffset); moveView.startAnimation(animation); dragPosition = holdPosition; final DragAdapter adapter = (DragAdapter) this .getAdapter(); isMoving = true; if (i == itemMoveNum - 1) animation .setAnimationListener(new Animation.AnimationListener() { @Override public void onAnimationStart( Animation animation) { } @Override public void onAnimationRepeat( Animation animation) { } @Override public void onAnimationEnd( Animation animation) { adapter.exchange(startPosition, endPosition); isMoving = false; Log.e("log", "isMoving=false===================================="); } }); } } } Log.e("log", "mDragPosition=" + mDragPosition + "=====tempPosition=" + tempPosition); mDragPosition = tempPosition; } } /** * 动画交换交换item * * @param dropPosition * @param dragPosition */ public void OnMove(int dropPosition, int dragPosition) { } /** * 停止拖拽我们将之前隐藏的item显示出来,并将镜像移除 */ private void onStopDrag() { // View view = getChildAt(mDragPosition - getFirstVisiblePosition()); // if (view != null) { // view.setVisibility(View.VISIBLE); // } DragAdapter adapter = (DragAdapter) this.getAdapter(); adapter.showDropItem(true); adapter.notifyDataSetChanged(); removeDragImage(); } /** * 获取状态栏的高度 * * @param context * @return */ private static int getStatusHeight(Context context) { int statusHeight = 0; Rect localRect = new Rect(); ((Activity) context).getWindow().getDecorView() .getWindowVisibleDisplayFrame(localRect); statusHeight = localRect.top; if (0 == statusHeight) { Class<?> localClass; try { localClass = Class.forName("com.android.internal.R$dimen"); Object localObject = localClass.newInstance(); int i5 = Integer.parseInt(localClass .getField("status_bar_height").get(localObject) .toString()); statusHeight = context.getResources().getDimensionPixelSize(i5); } catch (Exception e) { e.printStackTrace(); } } return statusHeight; } /** * 移动动画 * * @author wangxuanao * */ public Animation getMoveAnimation(float x, float y) { TranslateAnimation go = new TranslateAnimation( Animation.RELATIVE_TO_SELF, 0, Animation.RELATIVE_TO_SELF, x, Animation.RELATIVE_TO_SELF, 0, Animation.RELATIVE_TO_SELF, y); go.setFillAfter(true); go.setDuration(300); return go; } }
运行截图:
此demo支持长按滑动。支持动画效果,支持向下跨屏滑动。不过在跨屏滑动的时候存在bug。有兴趣的同学可以修改一下。源代码下载
解析---DragGridView长按动态排序,布布扣,bubuko.com
时间: 2024-10-25 18:20:29