編輯:關於Android編程
先看看效果圖
主要思想:
1、監聽觸碰事件
2、用WindowManager添加拖曳的圖片
3、用Collections.swap()交換List數據
自定義代碼:
public class DragGridVeiw extends GridView { private final int PRESS_TIME = 1000;//長按時間 private int mDownX;//觸碰時的X坐標 private int mDownY;//觸碰時的Y坐標 private int mMoveX;//移動時的X坐標 private int mMoveY;//移動時的Y坐標 private int mOffset2Top;//DragGridView距離屏幕頂部的偏移量 private int mOffset2Left;//DragGridView距離屏幕左邊的偏移量 private int mPointToItemTop;//觸碰點距離ItemView的上邊距 private int mPointToItemLeft;//觸碰點距離ItemView的左邊距 private int mStatusHeight;//狀態欄高度 private boolean isDraging;//是否正在拖曳 private Bitmap mBitmap;//ItemView的圖片 private int mTouchPostiion;//觸碰的位置 private View mTouchItemView;//觸碰的ItemView private Vibrator mVibrator;//震動器 private ImageView mDragImageView;//拖曳的View private WindowManager mWindowManager;//窗口管理器 private WindowManager.LayoutParams mWindowLayoutParams;//窗口管理器布局 private OnChanageListener onChanageListener;//交換事件監聽器 private Handler mHandler = new Handler(); public DragGridVeiw(Context context) { this(context, null); } public DragGridVeiw(Context context, AttributeSet attrs) { this(context, attrs, 0); } public DragGridVeiw(Context context, AttributeSet attrs, int defStyleAttr) { super(context, attrs, defStyleAttr); mStatusHeight = getStatusHeight(context); mVibrator = (Vibrator) context.getSystemService(Context.VIBRATOR_SERVICE); mWindowManager = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE); } @Override public boolean dispatchTouchEvent(MotionEvent ev) { switch (ev.getAction()) { case MotionEvent.ACTION_DOWN: //使用Handler延遲dragResponseMS執行mLongClickRunnable mHandler.postDelayed(mLongClickRunnable, PRESS_TIME); mDownX = (int) ev.getX(); mDownY = (int) ev.getY(); //根據按下的X,Y坐標獲取所點擊item的position mTouchPostiion = pointToPosition(mDownX, mDownY); if (mTouchPostiion == AdapterView.INVALID_POSITION) { return super.dispatchTouchEvent(ev); } //根據position獲取該item所對應的View mTouchItemView = getChildAt(mTouchPostiion - getFirstVisiblePosition()); //下面這幾個距離大家可以參考我的博客上面的圖來理解下 mPointToItemTop = mDownY - mTouchItemView.getTop(); mPointToItemLeft = mDownX - mTouchItemView.getLeft(); mOffset2Top = (int) (ev.getRawY() - mDownY); mOffset2Left = (int) (ev.getRawX() - mDownX); //開啟mDragItemView繪圖緩存 mTouchItemView.setDrawingCacheEnabled(true); //獲取mDragItemView在緩存中的Bitmap對象 mBitmap = Bitmap.createBitmap(mTouchItemView.getDrawingCache()); //這一步很關鍵,釋放繪圖緩存,避免出現重復的鏡像 mTouchItemView.destroyDrawingCache(); break; case MotionEvent.ACTION_MOVE: int moveX = (int) ev.getX(); int moveY = (int) ev.getY(); //拖曳點超出GridView區域則取消拖曳事件 if (ev.getY() > getHeight() || ev.getY() < 0) { onStopDrag(); } //如果我們在按下的item上面移動,只要超過item的邊界就移除mRunnable if (!isTouchInItem(mTouchItemView, moveX, moveY)) { mHandler.removeCallbacks(mLongClickRunnable); } break; case MotionEvent.ACTION_UP: mHandler.removeCallbacks(mLongClickRunnable); break; } return super.dispatchTouchEvent(ev); } @Override public boolean onTouchEvent(MotionEvent ev) { if (isDraging && mDragImageView != null) { switch (ev.getAction()) { case MotionEvent.ACTION_MOVE: mMoveX = (int) ev.getX(); mMoveY = (int) ev.getY(); //拖動item onDragItem(mMoveX, mMoveY); break; case MotionEvent.ACTION_UP: onStopDrag(); break; } return true; } return super.onTouchEvent(ev); } //處理長按事件的線程 private Runnable mLongClickRunnable = new Runnable() { @Override public void run() { isDraging = true; //設置可以拖拽 mVibrator.vibrate(50); //震動一下 mTouchItemView.setVisibility(View.INVISIBLE);//隱藏該ItemView //根據我們按下的點顯示ItemView鏡像 createDragView(mBitmap, mDownX, mDownY); } }; //添加拖動View private void createDragView(Bitmap bitmap, int downX, int downY) { mWindowLayoutParams = new WindowManager.LayoutParams(); mWindowLayoutParams.format = PixelFormat.TRANSLUCENT; //圖片之外的其他地方透明 mWindowLayoutParams.gravity = Gravity.TOP | Gravity.LEFT; mWindowLayoutParams.x = downX - mPointToItemTop + mOffset2Left; mWindowLayoutParams.y = downY - mPointToItemTop + mOffset2Top - mStatusHeight; mWindowLayoutParams.alpha = 0.6f; //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); } private void removeDragView() { if (mDragImageView != null) { mWindowManager.removeView(mDragImageView); mDragImageView = null; } } //是否點擊在GridView的item上面 private boolean isTouchInItem(View dragView, int x, int y) { int leftOffset = dragView.getLeft(); int topOffset = dragView.getTop(); if (x < leftOffset || x > leftOffset + dragView.getWidth()) { return false; } if (y < topOffset || y > topOffset + dragView.getHeight()) { return false; } return true; } //拖動事件處理 private void onDragItem(int moveX, int moveY) { mWindowLayoutParams.x = moveX - mPointToItemLeft + mOffset2Left; mWindowLayoutParams.y = moveY - mPointToItemTop + mOffset2Top - mStatusHeight; mWindowManager.updateViewLayout(mDragImageView, mWindowLayoutParams); //更新DragView的位置 onSwapItem(moveX, moveY);//Item的相互交換 } //交換item,並且控制item之間的顯示與隱藏效果 private void onSwapItem(int moveX, int moveY) { //獲取我們手指移動到的那個item的position int tempPosition = pointToPosition(moveX, moveY); //假如tempPosition 改變了並且tempPosition不等於-1,則進行交換 if (tempPosition != mTouchPostiion && tempPosition != AdapterView.INVALID_POSITION) { getChildAt(tempPosition - getFirstVisiblePosition()).setVisibility(View.INVISIBLE);//拖動到了新的item,新的item隱藏掉 getChildAt(mTouchPostiion - getFirstVisiblePosition()).setVisibility(View.VISIBLE);//之前的item顯示出來 if (onChanageListener != null) { onChanageListener.onChange(mTouchPostiion, tempPosition); } mTouchPostiion = tempPosition; } } //停止拖拽我們將之前隱藏的item顯示出來,並將DragView移除 private void onStopDrag() { isDraging = false; getChildAt(mTouchPostiion - getFirstVisiblePosition()).setVisibility(View.VISIBLE); removeDragView(); } //Item交換事件監聽 public void setOnChangeListener(OnChanageListener onChanageListener) { this.onChanageListener = onChanageListener; } //獲取狀態欄高度 private 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; } //當item交換位置的時候回調的方法,我們只需要在該方法中實現數據的交換即可 public interface OnChanageListener { public void onChange(int from, int to); } }
使用方法:
List<HashMap<String, Object>> dataSourceList = new ArrayList<>(); dragVeiw = (DragGridVeiw) findViewById(R.id.view_drag); for (int i = 0; i < 8; i++) { HashMap<String, Object> itemHashMap = new HashMap<>(); itemHashMap.put("item_image", R.drawable.sample_1); itemHashMap.put("item_text", "拖拽 " + Integer.toString(i)); dataSourceList.add(itemHashMap); } final SimpleAdapter mSimpleAdapter = new SimpleAdapter(this, dataSourceList, R.layout.item_drag, new String[]{"item_image", "item_text"}, new int[]{R.id.item_image, R.id.item_text}); dragVeiw.setAdapter(mSimpleAdapter); dragVeiw.setOnChangeListener(new DragGridVeiw.OnChanageListener() { @Override public void onChange(int from, int to) { HashMap<String, Object> temp = dataSourceList.get(from); //這裡的處理需要注意下 if (from < to) { for (int i = from; i < to; i++) { Collections.swap(dataSourceList, i, i + 1); } } else if (from > to) { for (int i = from; i > to; i--) { Collections.swap(dataSourceList, i, i - 1); } } dataSourceList.set(to, temp); mSimpleAdapter.notifyDataSetChanged(); } });
附錄:
Log.v("-->getWidth", String.valueOf(getWidth()));//DragView的寬度 Log.v("-->getHeight", String.valueOf(getHeight()));//DragView的高度 Log.v("-->getLeft", String.valueOf(getLeft()));//DragView左邊距離屏幕左側的長度 Log.v("-->getTop", String.valueOf(getTop()));///DragView上邊距離屏幕頂部的長度 Log.v("-->getRawX", String.valueOf(ev.getRawX()));//觸碰點相對於屏幕的X坐標 Log.v("-->getRawY", String.valueOf(ev.getRawY()));//觸碰點相對於屏幕的Y坐標 Log.v("-->getX", String.valueOf(ev.getX()));//觸碰點相對於DragView的X坐標 Log.v("-->getY", String.valueOf(ev.getY()));//觸碰點相對於DragView的Y坐標 Log.v("-->getItemWidth", String.valueOf(mTouchItemView.getWidth()));//DragView中ItemView的寬度 Log.v("-->getItemHeight", String.valueOf(mTouchItemView.getHeight()));//DragView中ItemView的高度 Log.v("-->getItemLeft", String.valueOf(mTouchItemView.getLeft()));//DragView中ItemView左邊距離DragView左側的長度 Log.v("-->getItemTop", String.valueOf(mTouchItemView.getTop()));//DragView中ItemView上邊距離DragView頂部的長度
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