近期项目需要做类似 android 主界面的 Laucher 风格的界面，来实现界面的用户操作，优化用户体验。很显示的这功能的实现是
通过对GridView类的改造来实现的。
效果图：
这功能的核心代码如下：
public class DragGridView extends GridView { private int dragPosition; private int dropPosition; // private ImageView dragImageView; ViewGroup fromView; Animation AtoB, BtoA, DelDone; int stopCount = 0; private G_PageListener pageListener; int moveNum; private G_ItemChangeListener itemListener; private int mLastX, xtox; boolean isCountXY = false; private int mLastY, ytoy; private WindowManager windowManager; private WindowManager.LayoutParams windowParams; private Context mContext; private ImageView iv_drag; public DragGridView(Context context, AttributeSet attrs) { super(context, attrs); mContext = context; } public DragGridView(Context context) { super(context); mContext = context; } boolean flag = false; public void setLongFlag(boolean temp) { flag = temp; } public boolean setOnItemLongClickListener(final MotionEvent ev) { this.setOnItemLongClickListener(new AdapterView.OnItemLongClickListener() { @Override public boolean onItemLongClick(AdapterView<?> arg0, View arg1, int arg2, long arg3) { Vibrator vibrator = (Vibrator) mContext .getSystemService(Service.VIBRATOR_SERVICE); vibrator.vibrate(100); Configure.isMove = true; isCountXY = false; int x = (int) ev.getX(); int y = (int) ev.getY(); mLastX = x; mLastY = y; dragPosition = dropPosition = arg2; if (dragPosition == AdapterView.INVALID_POSITION) { return false; } fromView = (ViewGroup) getChildAt(dragPosition - getFirstVisiblePosition()); // itemHeight = fromView.getHeight(); // itemWidth = fromView.getWidth(); fromView.destroyDrawingCache(); fromView.setDrawingCacheEnabled(true); fromView.setDrawingCacheBackgroundColor(0xff6DB7ED); Bitmap bm = Bitmap.createBitmap(fromView.getDrawingCache()); Bitmap bitmap = Bitmap.createBitmap(bm, 8, 8, bm.getWidth() – 16, bm.getHeight() – 8); startDrag(bitmap, x, y); 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); } private void startDrag(final Bitmap bm, final int x, final int y) { windowManager = (WindowManager) getContext().getSystemService( Context.WINDOW_SERVICE);// “window” Animation disappear = AnimationUtils.loadAnimation(getContext(), R.anim.griditem_longclick_disappear); disappear.setAnimationListener(new Animation.AnimationListener() { @Override public void onAnimationStart(Animation animation) { } @Override public void onAnimationRepeat(Animation animation) { } @Override public void onAnimationEnd(Animation animation) { // TODO Auto-generated method stub fromView.setVisibility(8); stopDrag(); windowParams = new WindowManager.LayoutParams(); windowParams.gravity = Gravity.TOP | Gravity.LEFT; windowParams.x = fromView.getLeft() + 28; windowParams.y = fromView.getTop() + (int) (40 * Configure.screenDensity) + 8; windowParams.alpha = 0.8f; windowParams.height = WindowManager.LayoutParams.WRAP_CONTENT; windowParams.width = WindowManager.LayoutParams.WRAP_CONTENT; iv_drag = new ImageView(getContext()); iv_drag.setImageBitmap(bm); windowManager.addView(iv_drag, windowParams); } }); fromView.startAnimation(disappear); pageListener.page(1, -100); } @Override public boolean onTouchEvent(MotionEvent ev) { if (iv_drag != null && dragPosition != AdapterView.INVALID_POSITION) { int x = (int) ev.getX(); int y = (int) ev.getY(); switch (ev.getAction()) { case MotionEvent.ACTION_MOVE: if (!isCountXY) { xtox = x – mLastX; ytoy = y – mLastY; isCountXY = true; } onDrag(x, y); break; case MotionEvent.ACTION_UP: stopDrag(); onDrop(x, y); break; } // mLastX=x;mLastY=y; } return super.onTouchEvent(ev); } private void onDrag(int x, int y) { if (iv_drag != null) { windowParams.alpha = 0.8f; windowParams.x = (x – mLastX – xtox) + fromView.getLeft() + 28 - moveNum * Configure.screenWidth; windowParams.y = (y – mLastY – ytoy) + fromView.getTop() + (int) (40 * Configure.screenDensity) + 8; windowManager.updateViewLayout(iv_drag, windowParams); } if ((x > (Configure.screenWidth / 2 – 100) && x < (Configure.screenWidth / 2 + 100)) && (y > Configure.screenHeight – 200)) { pageListener.page(2, -100); return; } if (Configure.isDelDark) { pageListener.page(3, -200); } if (moveNum > 0) { if ((x >= (moveNum + 1) * Configure.screenWidth – 20 * Configure.screenDensity || x <= moveNum * Configure.screenWidth) && !Configure.isChangingPage) stopCount++; else stopCount = 0; if (stopCount > 10) { stopCount = 0; if (x >= (moveNum + 1) * Configure.screenWidth – 20 * Configure.screenDensity && Configure.curentPage < Configure.countPages – 1) { Configure.isChangingPage = true; pageListener.page(0, ++Configure.curentPage); moveNum++; } else if (x <= moveNum * Configure.screenWidth && Configure.curentPage > 0) { Configure.isChangingPage = true; pageListener.page(0, –Configure.curentPage); moveNum–; } } } else { // 开始MOVE if ((x >= (moveNum + 1) * Configure.screenWidth – 20 * Configure.screenDensity || x <= moveNum * Configure.screenWidth) && !Configure.isChangingPage) stopCount++; else stopCount = 0; if (stopCount > 10) { stopCount = 0; if (x >= (moveNum + 1) * Configure.screenWidth – 20 * Configure.screenDensity && Configure.curentPage < Configure.countPages – 1) { Configure.isChangingPage = true; pageListener.page(0, ++Configure.curentPage); moveNum++; } else if (x <= moveNum * Configure.screenWidth && Configure.curentPage > 0) { Configure.isChangingPage = true; pageListener.page(0, –Configure.curentPage); moveNum–; } } } } public void setPageListener(G_PageListener pageListener) { this.pageListener = pageListener; } public interface G_PageListener { void page(int cases, int page); } public void setOnItemChangeListener(G_ItemChangeListener pageListener) { this.itemListener = pageListener; } public interface G_ItemChangeListener { void change(int from, int to, int count); } private void onDrop(int x, int y) { fromView.setDrawingCacheBackgroundColor(0); Configure.isMove = false; if (Configure.isDelDark) { DelDone = getDelAnimation(x, y);// AnimationUtils.loadAnimation(getContext(), // R.anim.del_done); DelDone.setAnimationListener(new Animation.AnimationListener() { @Override public void onAnimationStart(Animation animation) { } @Override public void onAnimationRepeat(Animation animation) { } @Override public void onAnimationEnd(Animation animation) { // TODO Auto-generated method stub Configure.removeItem = dragPosition; pageListener.page(5, -300); } }); fromView.setVisibility(0); fromView.startAnimation(DelDone); return; } pageListener.page(4, -300); int tempPosition = pointToPosition(x – moveNum * Configure.screenWidth, y); if (tempPosition != AdapterView.INVALID_POSITION) { dropPosition = tempPosition; } if (moveNum != 0) { itemListener.change(dragPosition, dropPosition, moveNum); moveNum = 0; return; } moveNum = 0; ViewGroup toView = (ViewGroup) getChildAt(dropPosition - getFirstVisiblePosition()); final DragGridAdapter adapter = (DragGridAdapter) this.getAdapter(); if (dragPosition % 2 == 0) {//移动动画 AtoB = getDownAnimation((dropPosition % 2 == dragPosition % 2) ? 0 : 1, (dropPosition / 2 – dragPosition / 2)); if (dropPosition != dragPosition) toView.startAnimation(getMyAnimation( (dragPosition % 2 == dropPosition % 2) ? 0 : -1, (dragPosition / 2 – dropPosition / 2))); } else { AtoB = getDownAnimation((dropPosition % 2 == dragPosition % 2) ? 0 : -1, (dropPosition / 2 – dragPosition / 2)); if (dropPosition != dragPosition) toView.startAnimation(getMyAnimation( (dragPosition % 2 == dropPosition % 2) ? 0 : 1, (dragPosition / 2 – dropPosition / 2))); } fromView.startAnimation(AtoB); AtoB.setAnimationListener(new Animation.AnimationListener() { @Override public void onAnimationStart(Animation arg0) { } @Override public void onAnimationRepeat(Animation arg0) { } @Override public void onAnimationEnd(Animation arg0) { // TODO Auto-generated method stub adapter.exchange(dragPosition, dropPosition); adapter.notifyDataSetChanged(); } }); } /** * 删除原位置的图片 */ private void stopDrag() { if (iv_drag != null) { windowManager.removeView(iv_drag); iv_drag = null; } } public Animation getMyAnimation(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(550); return go; } public Animation getDownAnimation(float x, float y) { AnimationSet set = new AnimationSet(true); TranslateAnimation go = new TranslateAnimation( Animation.RELATIVE_TO_SELF, x, Animation.RELATIVE_TO_SELF, x, Animation.RELATIVE_TO_SELF, y, Animation.RELATIVE_TO_SELF, y); go.setFillAfter(true); go.setDuration(550); AlphaAnimation alpha = new AlphaAnimation(0.1f, 1.0f); alpha.setFillAfter(true); alpha.setDuration(550); ScaleAnimation scale = new ScaleAnimation(1.2f, 1.0f, 1.2f, 1.0f); scale.setFillAfter(true); scale.setDuration(550); set.addAnimation(go); set.addAnimation(alpha); set.addAnimation(scale); return set; } public Animation getDelAnimation(int x, int y) { AnimationSet set = new AnimationSet(true); // TranslateAnimation go = new TranslateAnimation(Animation.ABSOLUTE, // x-itemWidth/2, Animation.ABSOLUTE, x-itemWidth/2, // Animation.ABSOLUTE, y-itemHeight/2, Animation.ABSOLUTE, // y-itemHeight/2); // go.setFillAfter(true);go.setDuration(1550); RotateAnimation rotate = new RotateAnimation(0, 360, Animation.RELATIVE_TO_SELF, 0.5f, Animation.RELATIVE_TO_SELF, 0.5f); rotate.setFillAfter(true); rotate.setDuration(550); AlphaAnimation alpha = new AlphaAnimation(1.0f, 0.0f); alpha.setFillAfter(true); alpha.setDuration(550); // ScaleAnimation scale = new // ScaleAnimation(1.0f,0.0f,1.0f,0.0f,Animation.RELATIVE_TO_SELF,0.5f,Animation.RELATIVE_TO_SELF,0.5f); // scale.setFillAfter(true);scale.setDuration(550); // set.addAnimation(rotate); set.addAnimation(alpha); set.addAnimation(rotate); return set; } }
实现了长按移动和交换，底部删除的功能。
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