android gridview中item的拖动及动画实现demo

package ty.com.android.container; import ty.com.android.container.adapter.LinkInfoAdapter; import ty.com.android.container.util.Configure; import android.content.Context; import android.graphics.Bitmap; import android.graphics.PixelFormat; import android.util.AttributeSet; import android.util.Log; import android.view.Gravity; import android.view.MotionEvent; import android.view.View; import android.view.ViewGroup; import android.view.WindowManager; import android.view.animation.Animation; import android.view.animation.TranslateAnimation; import android.view.animation.Animation.AnimationListener; import android.widget.AdapterView; import android.widget.GridView; import android.widget.ImageView; public class DragGridView extends GridView { private static final String TAG = "DragGridView"; private int dragPosition;// 开始拖拽的位置 private int startPosition;//交换起始位置 private int holdPosition;//手指拖动时的位置 private int dropPosition;// 结束拖拽的位置 private int dragPointX; // 相对于item左上角的x坐标 private int dragPointY; // 相对于item左上角的y坐标 private int dragOffsetX; private int dragOffsetY; private int mColumns = 3; private int moveUpX;//action_up时的x坐标 private int moveUpY;//action_up时的y坐标 private ImageView dragImageView; // 拖动item的preview private ViewGroup dragViewGroup; private WindowManager windowManager; private WindowManager.LayoutParams windowParams; private LinkInfoAdapter adapter; private String mLastAnimationID; private boolean isMoving = false; public DragGridView(Context context, AttributeSet attrs) { super(context, attrs); } public DragGridView(Context context) { super(context); } private boolean setOnItemLongClickListener(final MotionEvent event) { this.setOnItemLongClickListener(new OnItemLongClickListener() { @Override public boolean onItemLongClick(AdapterView<?> parent, View view, int position, long id) { // TODO Auto-generated method stub Log.i(TAG, "onItemLongClick"); return false; } }); return super.onInterceptTouchEvent(event); } @Override public boolean onInterceptTouchEvent(MotionEvent event) { if (event.getAction() == MotionEvent.ACTION_DOWN) { Log.i(TAG, "onInterceptTouchEvent--->MotionEvent.ACTION_DOWN"); //return setOnItemLongClickListener(event); int x = (int) event.getX(); int y = (int) event.getY(); dragPosition = pointToPosition(x, y); //dragPosition = holdPosition = dropPosition = position; startPosition = holdPosition = dropPosition = dragPosition; Log.i(TAG, "dragPosition = " + dragPosition); if (dragPosition == AdapterView.INVALID_POSITION) { return false; } dragViewGroup = (ViewGroup) getChildAt(dragPosition - getFirstVisiblePosition()); // 得到当前点在item内部的偏移量 即相对于item左上角的坐标 dragPointX = x - dragViewGroup.getLeft(); dragPointY = y - dragViewGroup.getTop(); Log.i(TAG, "X: " + x + ",dragPointX: " + dragPointX + ",dragPointY: " + dragPointY); dragOffsetX = (int) (event.getRawX() - x); dragOffsetY = (int) (event.getRawY() - y);//此值计算为状态栏和标题栏的宽度总和 Log.i(TAG, "X: " + x + ",dragOffsetX: " + dragOffsetX + ",dragOffsetY: " + dragOffsetY); adapter = (LinkInfoAdapter) DragGridView.this.getAdapter(); Bitmap bitmap = getDragCacheBitmap(dragViewGroup); startDrag(bitmap, x, y); adapter.setHoldPosition(holdPosition); adapter.notifyDataSetChanged(); isMoving = false; return false; } return super.onInterceptTouchEvent(event); } /** * 获取拖拽图标位图 * @param itemView * @return */ private Bitmap getDragCacheBitmap(View itemView){ // 每次都销毁一次cache，重新生成一个bitmap itemView.destroyDrawingCache(); itemView.setDrawingCacheEnabled(true); Bitmap bm = Bitmap.createBitmap(itemView.getDrawingCache()); return bm; } /** * 设置拖拽图标相对窗体位置 * @param event */ private void setWindowParams(int x, int y) { // 建立item的缩略图 windowParams = new WindowManager.LayoutParams(); windowParams.gravity = Gravity.TOP | Gravity.LEFT;// 这个必须加 // 得到preview左上角相对于屏幕的坐标 windowParams.x = x - dragPointX + dragOffsetX; windowParams.y = y - dragPointY + dragOffsetY; // 设置宽和高 windowParams.height = WindowManager.LayoutParams.WRAP_CONTENT; windowParams.width = WindowManager.LayoutParams.WRAP_CONTENT; windowParams.flags = WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE | WindowManager.LayoutParams.FLAG_NOT_TOUCHABLE | WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON | WindowManager.LayoutParams.FLAG_LAYOUT_IN_SCREEN; windowParams.format = PixelFormat.TRANSLUCENT; windowParams.windowAnimations = 0; } /** * 开始拖拽,拖出图标 * @param event */ private void startDrag(Bitmap bm, int x, int y) { stopDrag(); if (dragPosition != AdapterView.INVALID_POSITION) { setWindowParams(x, y); dragImageView = new ImageView(getContext()); dragImageView.setImageBitmap(bm); windowManager = (WindowManager) getContext().getSystemService(Context.WINDOW_SERVICE); windowManager.addView(dragImageView, windowParams); } } @Override public boolean onTouchEvent(MotionEvent event) { if (dragImageView != null && dragPosition != AdapterView.INVALID_POSITION) { int x = (int) event.getX(); int y = (int) event.getY(); switch (event.getAction()) { case MotionEvent.ACTION_DOWN: //startDrag(event); //从onInterceptTouchEvent接收到ACTION_DOWN事件 Log.i(TAG, "onTouchEvent-->ACTION_DOWN"); break; case MotionEvent.ACTION_MOVE: onDrag(x, y); if(!isMoving){ onMove(x, y); } break; case MotionEvent.ACTION_UP: moveUpX = x; moveUpY = y; onDrop(); break; } } return true; } /** * 拖拽中...如何加动画? * @param x * @param y */ private void onDrag(int x, int y) { if (dragImageView != null) { //windowParams.alpha = 0.8f; windowParams.x = x - dragPointX + dragOffsetX; windowParams.y = y - dragPointY + dragOffsetY; windowManager.updateViewLayout(dragImageView, windowParams); } } /** * 加动画 * @param x * @param y */ private void onMove(int x, int y){ int tempPosition = pointToPosition(x, y); if(tempPosition != -1 && tempPosition != dragPosition){ dropPosition = tempPosition; } if(dragPosition != startPosition){ dragPosition = startPosition; } int moveNum = dropPosition - dragPosition; if(moveNum != 0){ int itemMoveNum = Math.abs(moveNum); float xOffset,yOffset; for(int i = 0;i < itemMoveNum;i++){ if(moveNum > 0){ holdPosition = dragPosition + 1; xOffset = (holdPosition/mColumns == dragPosition/mColumns) ? (-1) : (mColumns - 1); yOffset = (holdPosition/mColumns == dragPosition/mColumns) ? 0 : (-1); }else{ holdPosition = dragPosition - 1; xOffset = (holdPosition/mColumns == dragPosition/mColumns) ? 1 : (-(mColumns - 1)); yOffset = (holdPosition/mColumns == dragPosition/mColumns) ? 0 : 1; } adapter.setHoldPosition(holdPosition); Log.i(TAG, "holdPosition = " + holdPosition); final ViewGroup moveView = (ViewGroup) getChildAt(holdPosition); Animation animation = getMoveAnimation(xOffset, yOffset); moveView.startAnimation(animation); dragPosition = holdPosition; Log.i(TAG, "dragPosition = " + dragPosition); if(dragPosition == dropPosition){ mLastAnimationID = animation.toString(); } animation.setAnimationListener(new AnimationListener() { @Override public void onAnimationStart(Animation animation) { // TODO Auto-generated method stub isMoving = true; } @Override