可自由设置不能拖拽的位置,选中的位置,及拖拽的镜像样式
import android.annotation.SuppressLint; import android.app.Activity; import android.content.Context; import android.content.res.ColorStateList; import android.graphics.Bitmap; import android.graphics.Canvas; import android.graphics.Color; import android.graphics.Paint; import android.graphics.Rect; import android.os.Handler; import android.os.Vibrator; import android.support.annotation.NonNull; 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.ViewParent; import android.view.WindowManager; import android.widget.AbsListView; import android.widget.AdapterView; import android.widget.GridView; import android.widget.ImageView; import android.widget.TextView; import com.dealmoon.android.R; import com.north.expressnews.home.TextViewAdapter; public class DragGridViewItemLine 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 */ private long dragResponseMS = 1000; /** * 是否可以拖拽,默认不可以 */ private boolean isDrag = false; /** * 功能设置:是否能拖拽 */ private boolean dragEnable = true; /** * 设置不能拖动的位置 * 忽略的位置,用于长按此类位置不进行移动 */ private int[] ignorePositions; private int mDownX; private int mDownY; private int moveX; private int moveY; /** * 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; private boolean isNeedItemBorder = true; private int mDragItemBackground = 0; public void setNeedItemBorder(boolean needItemBorder) { isNeedItemBorder = needItemBorder; } public void setDragItemBackground(int bg) { mDragItemBackground = bg; } /** * item发生变化回调的接口 */ private OnChanageListener onChanageListener; public DragGridViewItemLine(Context context) { this(context, null); } public DragGridViewItemLine(Context context, AttributeSet attrs) { this(context, attrs, 0); } public DragGridViewItemLine(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 } public void setDragEnable(boolean enable) { dragEnable = enable; } /** * 设置不能拖动的位置 * 忽略的位置,用于长按此类位置不进行移动 */ public void setIgnoreDragPosition(@NonNull int[] ignorePositions) { this.ignorePositions = ignorePositions; } private boolean checkIsIgnoreDragPosition(int dragPosition) { if (ignorePositions != null) { for (int i = 0, j = ignorePositions.length; i < j; i++) { if (dragPosition == ignorePositions[i]) { return true; } } } return false; } 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 mVibrator.vibrate(50); // 震动一下 ColorStateList colorStateList = setTextColor(mStartDragItemView, getContext().getResources().getColor(R.color.white)); // 开启mDragItemView绘图缓存 mStartDragItemView.setDrawingCacheEnabled(true); // 缓存背景色 if (mDragItemBackground != 0) { mStartDragItemView.setBackgroundResource(mDragItemBackground); mStartDragItemView.setDrawingCacheBackgroundColor(Color.TRANSPARENT); } else { mStartDragItemView.setDrawingCacheBackgroundColor(getContext().getResources().getColor(R.color.dm_main)); } // 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(); setTextColor(mStartDragItemView, colorStateList); 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); } }; private ColorStateList setTextColor(View parentView, int textColor) { ColorStateList colorStateList = null; System.out.println("setTextColor "+parentView.toString()); if (parentView instanceof TextView) { colorStateList = ((TextView) parentView).getTextColors(); ((TextView) parentView).setTextColor(textColor); parentView.invalidate(); } // else if (parentView instanceof AbsListView) { // for (int i = 0, j = ((AbsListView) parentView).getChildCount(); i < j; i++) { // if (((AbsListView) parentView).getChildAt(i) instanceof TextView) { // TextView tx = (TextView) ((AbsListView) parentView).getChildAt(i); // // colorStateList = tx.getTextColors(); // // tx.setTextColor(textColor); // tx.invalidate(); // } // // } // } else if (parentView instanceof ViewGroup) { for (int i = 0, j = ((ViewGroup) parentView).getChildCount(); i < j; i++) { if (((ViewGroup) parentView).getChildAt(i) instanceof TextView) { TextView tx = (TextView) ((ViewGroup) parentView).getChildAt(i); colorStateList = tx.getTextColors(); tx.setTextColor(textColor); tx.invalidate(); } } } return colorStateList; } private void setTextColor(View parentView, ColorStateList colorStateList) { if (parentView instanceof TextView) { ((TextView) parentView).setTextColor(colorStateList); parentView.invalidate(); } // else if (parentView instanceof AbsListView) { // for (int i = 0, j = ((AbsListView) parentView).getChildCount(); i < j; i++) { // if (((AbsListView) parentView).getChildAt(i) instanceof TextView) { // TextView tx = (TextView) ((AbsListView) parentView).getChildAt(i); // tx.setTextColor(colorStateList); // tx.invalidate(); // } // // } // } else if (parentView instanceof ViewGroup) { for (int i = 0, j = ((ViewGroup) parentView).getChildCount(); i < j; i++) { if (((ViewGroup) parentView).getChildAt(i) instanceof TextView) { TextView tx = (TextView) ((ViewGroup) parentView).getChildAt(i); tx.setTextColor(colorStateList); tx.invalidate(); } } } } /** * 设置回调接口 * * @param onChanageListener */ public void setOnChangeListener(OnChanageListener onChanageListener) { this.onChanageListener = onChanageListener; } /** * 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; } @Override protected void dispatchDraw(Canvas canvas) { super.dispatchDraw(canvas); if (isNeedItemBorder) { View localView1 = getChildAt(0); int column = getWidth() / localView1.getWidth(); int childCount = getChildCount(); Paint localPaint; localPaint = new Paint(); localPaint.setStyle(Paint.Style.STROKE); localPaint.setColor(getContext().getResources().getColor(R.color.dm_line)); for (int i = 0; i < childCount; i++) { View cellView = getChildAt(i); if ((i + 1) % column == 0) { canvas.drawLine(cellView.getLeft(), cellView.getBottom(), cellView.getRight(), cellView.getBottom(), localPaint); } else if ((i + 1) > (childCount - (childCount % column))) { canvas.drawLine(cellView.getRight(), cellView.getTop(), cellView.getRight(), cellView.getBottom(), localPaint); } else { canvas.drawLine(cellView.getRight(), cellView.getTop(), cellView.getRight(), cellView.getBottom(), localPaint); canvas.drawLine(cellView.getLeft(), cellView.getBottom(), cellView.getRight(), cellView.getBottom(), localPaint); } } if (childCount % column != 0) { for (int j = 0; j < (column - childCount % column); j++) { View lastView = getChildAt(childCount - 1); canvas.drawLine(lastView.getRight() + lastView.getWidth() * j, lastView.getTop(), lastView.getRight() + lastView.getWidth() * j, lastView.getBottom(), localPaint); } } } } @Override public boolean dispatchTouchEvent(MotionEvent ev) { if (!dragEnable) { return super.dispatchTouchEvent(ev); } switch (ev.getAction()) { case MotionEvent.ACTION_DOWN: mDownX = (int) ev.getX(); mDownY = (int) ev.getY(); mDragPosition = pointToPosition(mDownX, mDownY); Log.i("+++++++itempos++++++", mDragPosition + "----" + getAdapter().getCount()); if (mDragPosition == 0 || mDragPosition == AdapterView.INVALID_POSITION) { return super.dispatchTouchEvent(ev); } if (checkIsIgnoreDragPosition(mDragPosition)) { return super.dispatchTouchEvent(ev); } if (getParent() != null) { getParent().requestDisallowInterceptTouchEvent(true); } if (mDragPosition < getAdapter().getCount()) { // 使用Handler延迟dragResponseMS执行mLongClickRunnable mHandler.postDelayed(mLongClickRunnable, dragResponseMS); } // 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); // // 缓存背景色 // mStartDragItemView.setDrawingCacheBackgroundColor(Color.parseColor("#FFFFFF00")); // // 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(); break; case MotionEvent.ACTION_MOVE: int moveX = (int) ev.getX(); int moveY = (int) ev.getY(); if (getParent() != null) { getParent().requestDisallowInterceptTouchEvent(true); } // 如果我们在按下的item上面移动,只要不超过item的边界我们就不移除mRunnable if (!isTouchInItem(mStartDragItemView, moveX, moveY)) { mHandler.removeCallbacks(mLongClickRunnable); } break; case MotionEvent.ACTION_UP: int moveXup = (int) ev.getX(); int moveYup = (int) ev.getY(); // if (Math.abs(moveXup - mDownX) < 5 && Math.abs(moveYup - mDownY) // < 5) { // isDrag = true; // } else { // isDrag = false; // } if (getParent() != null) { getParent().requestDisallowInterceptTouchEvent(true); } mHandler.removeCallbacks(mLongClickRunnable); mHandler.removeCallbacks(mScrollRunnable); break; } super.dispatchTouchEvent(ev); // Log.i("+++++++ACTION_UP++++++", "+++++++ACTION_UP++++++" +longclick // ); return super.dispatchTouchEvent(ev); } /** * 是否点击在GridView的item上面 * * @param dragView * @param x * @param y * @return */ private boolean isTouchInItem(View dragView, int x, int y) { if (dragView == null) { return false; } 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; } @SuppressLint("ClickableViewAccessibility") @Override public boolean onTouchEvent(MotionEvent ev) { if (!dragEnable) { return super.onTouchEvent(ev); } 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; 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) { 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; mWindowLayoutParams.y = downY - mPoint2ItemTop + mOffset2Top - mStatusHeight; // 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 moveX * @param moveY */ private void onDragItem(int moveX, int moveY) { mWindowLayoutParams.x = moveX - mPoint2ItemLeft + mOffset2Left; mWindowLayoutParams.y = moveY - mPoint2ItemTop + mOffset2Top - mStatusHeight; 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 (getFirstVisiblePosition() == 0 || getLastVisiblePosition() == getCount() - 1) { mHandler.removeCallbacks(mScrollRunnable); } 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 int tempPosition = pointToPosition(moveX, moveY); if(tempPosition == 0){ return; } else if (tempPosition < getAdapter().getCount()) { // 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) { if (onChanageListener != null) { onChanageListener.onChange(mDragPosition, tempPosition); } 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 mDragPosition = tempPosition; } } } /** * 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); } if (this.getAdapter() instanceof OnHideItemListener) { ((OnHideItemListener) getAdapter()).onItemHide(-1); } 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; } /** * @author xiaanming */ public interface OnChanageListener { /** * 当item交换位置的时候回调的方法,我们只需要在该方法中实现数据的交换即可 * * @param form 开始的position * @param to 拖拽到的position */ public void onChange(int form, int to); } /** * hide item * <p> * Created by hl on 2017/4/10. */ public interface OnHideItemListener { public void onItemHide(int position); } }