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1、完美1比1 仿照微信仿微信发动态 九宫格拖拽、删除

暴力拖拽ui有点问题，不影响使用，资源文件自己找个+号

2、微信发动态拖拽bug

当选择完图片，长按图片拖拽过程中按下屏幕home键盘，再次进入这时候就不能点击输入文字，点击输入文字的时候会触发选择相册事件

3、拖拽事件用的basequickadapter

implementation 'com.android.support:recyclerview-v7:28.0.0' implementation "com.github.CymChad:BaseRecyclerViewAdapterHelper:2.9.50" implementation "com.github.bumptech.glide:glide:4.9.0"

4、快速入手

activity NineGridChooseImage nineGridChooseImage = findViewById(R.id.nineGridChooseImage); FrameLayout frameLayout= findViewById(R.id.frameLayout); nineGridChooseImage.init(frameLayout); int statusBarHeight = 0; int resourceId = getResources().getIdentifier("status_bar_height", "dimen", "android"); if (resourceId > 0) {  statusBarHeight = getResources().getDimensionPixelSize(resourceId); } nineGridChooseImage.setFixH(statusBarHeight);//自己对一下高度 nineGridChooseImage.setAddClick(new NineGridChooseImage.AddClick() {  @Override  public void onAdd() {  /* List list = new LinkedList<>();  for(int i = 0;i<5;i++){   list.add("/upload/otherpic58/46599.jpg");  }*/  nineGridChooseImage.addData("/upload/otherpic58/46605.jpg");  } });

xml

5、实现过程

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NineGridChooseImage.javapackage com.example.hotfix_01.view;import android.animation.Animator;import android.animation.AnimatorListenerAdapter;import android.animation.ObjectAnimator;import android.app.Activity;import android.content.Context;import android.graphics.Canvas;import android.graphics.Color;import android.graphics.Point;import android.graphics.Rect;import android.support.annotation.NonNull;import android.support.annotation.Nullable;import android.support.v7.widget.GridLayoutManager;import android.support.v7.widget.RecyclerView;import android.support.v7.widget.helper.ItemTouchHelper;import android.text.TextUtils;import android.util.AttributeSet;import android.util.Log;import android.view.Display;import android.view.Gravity;import android.view.View;import android.view.ViewGroup;import android.widget.FrameLayout;import android.widget.ImageView;import android.widget.LinearLayout;import android.widget.TextView;import com.bumptech.glide.Glide;import com.chad.library.adapter.base.BaseItemDraggableAdapter;import com.chad.library.adapter.base.BaseViewHolder;import com.chad.library.adapter.base.callback.ItemDragAndSwipeCallback;import com.chad.library.adapter.base.listener.OnItemDragListener;import java.util.LinkedList;import java.util.List;import top.antaikeji.base.R;import top.antaikeji.foundation.utils.DisplayUtil;import static android.support.v7.widget.helper.ItemTouchHelper.ACTION_STATE_IDLE;/** * Author: flyzhang */public class NineGridChooseImage extends RecyclerView { private Rect lastRect = new Rect(); private Rect rect = new Rect(); private boolean isDel = false, tempImageDel = false; private int mSelectPosition = 0; private int SCREEN_W, SCREEN_H; private int mImageWH; private int mImageCount = 4; private DraggableAdapter mDraggableAdapter; private LinearLayout mBottomView; private FrameLayout mFrameLayout; private AddClick mAddClick; private DragCallBack mDragCallBack; private ImageView mTempImage; ; private int mFixH = 0; private int bottomViewH = 55; private ImageView trash; private int margin = 2; public NineGridChooseImage(@NonNull Context context) { super(context); } public NineGridChooseImage(@NonNull Context context, @Nullable AttributeSet attrs) { super(context, attrs); } public void init(FrameLayout f) { this.mFrameLayout = f; Display defaultDisplay = ((Activity) getContext()).getWindowManager().getDefaultDisplay(); Point point = new Point(); defaultDisplay.getSize(point); SCREEN_H = point.y; SCREEN_W = point.x; mImageWH = SCREEN_W / 3 - 2 * DisplayUtil.dpToPx(5) - 4 * DisplayUtil.pxToDp(20) - DisplayUtil.pxToDp(50); bottomViewH = DisplayUtil.dpToPx(bottomViewH); margin = DisplayUtil.dpToPx(margin); mTempImage = new ImageView(getContext()); mTempImage.setScaleType(ImageView.ScaleType.FIT_XY); //初始化底部view mBottomView = new LinearLayout(getContext()); mBottomView.setGravity(Gravity.CENTER); mBottomView.setBackgroundColor(Color.RED); FrameLayout.LayoutParams bottomLayoutParams = new FrameLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, bottomViewH); bottomLayoutParams.gravity = Gravity.BOTTOM; trash = new ImageView(getContext()); int wh = DisplayUtil.dpToPx(25); FrameLayout.LayoutParams trashParams = new FrameLayout.LayoutParams(wh, wh); trash.setLayoutParams(trashParams); mBottomView.addView(trash); TextView tipTextView = new TextView(getContext()); tipTextView.setTextColor(Color.WHITE); tipTextView.setText("拖拽此处删除"); mBottomView.addView(tipTextView); mBottomView.setOrientation(LinearLayout.VERTICAL); mBottomView.setLayoutParams(bottomLayoutParams); mBottomView.setVisibility(GONE); out(); mFrameLayout.addView(mBottomView); GridLayoutManager gridLayoutManager = new GridLayoutManager(getContext(), 3); setLayoutManager(gridLayoutManager); List data = new LinkedList<>(); data.add(""); mDraggableAdapter = new DraggableAdapter(data); DragAndSwipeCallback mItemDragAndSwipeCallback = new DragAndSwipeCallback(mDraggableAdapter); ItemTouchHelper itemTouchHelper = new ItemTouchHelper(mItemDragAndSwipeCallback); itemTouchHelper.attachToRecyclerView(this); mDraggableAdapter.enableDragItem(itemTouchHelper, R.id.image, true); mItemDragAndSwipeCallback.setSwipeMoveFlags(ItemTouchHelper.START | ItemTouchHelper.END); mDraggableAdapter.setOnItemDragListener(new OnItemDragListener() {  @Override  public void onItemDragStart(RecyclerView.ViewHolder viewHolder, int pos) {  if(null!=mDragCallBack){   mDragCallBack.onStart();  }  mSelectPosition = pos;  mFrameLayout.removeView(mTempImage);  tempImageDel = false;  isDel = false;  in();  ImageView imageView = viewHolder.itemView.findViewById(R.id.image);  mTempImage.setImageDrawable(imageView.getDrawable());  ViewGroup.LayoutParams l = new ViewGroup.LayoutParams(imageView.getWidth(), imageView.getHeight());  mTempImage.setLayoutParams(l);  imageView.getGlobalVisibleRect(lastRect);  mTempImage.setX(lastRect.left);  mTempImage.setY(lastRect.top - mFixH);  mTempImage.setScaleX(1.2f);  mTempImage.setScaleY(1.2f);  mFrameLayout.addView(mTempImage);  imageView.setAlpha(0f);  }  @Override  public void onItemDragMoving(RecyclerView.ViewHolder source, int from, RecyclerView.ViewHolder target, int to) {  target.itemView.findViewById(R.id.image).getGlobalVisibleRect(lastRect);  mSelectPosition = to;  }  @Override  public void onItemDragEnd(RecyclerView.ViewHolder viewHolder, int pos) {  if(null!=mDragCallBack){   mDragCallBack.onEnd();  }  ImageView imageView = viewHolder.itemView.findViewById(R.id.image);  imageView.setScaleX(1f);  imageView.setScaleY(1f);  if (tempImageDel) {   mDraggableAdapter.remove(mSelectPosition);  } else {   imageView.setAlpha(1f);   mFrameLayout.removeView(mTempImage);  }  out();  } }); setAdapter(mDraggableAdapter); } public void setFixH(int mFixH) { this.mFixH = mFixH; } /** * 拖住adapter */ private class DraggableAdapter extends BaseItemDraggableAdapter { private DraggableAdapter(List data) {  super(R.layout.base_iamge_item, data); } @Override protected void convert(@NonNull BaseViewHolder helper, String item) {  ImageView imageView = helper.getView(R.id.image);//图片  LinearLayout.LayoutParams l = (LinearLayout.LayoutParams) imageView.getLayoutParams();  l.height = mImageWH;  l.width = mImageWH;  l.rightMargin = margin;  l.bottomMargin = margin;  l.topMargin = margin;  imageView.setLayoutParams(l);  ImageView imageView2 = helper.getView(R.id.image2);//加号  LinearLayout.LayoutParams l2 = (LinearLayout.LayoutParams) imageView.getLayoutParams();  l2.height = mImageWH;  l2.width = mImageWH;  l2.rightMargin = margin;  l2.bottomMargin = margin;  l2.topMargin = margin;  imageView2.setLayoutParams(l2);  /**  * 如果list的长度等于mImageCount 最后一张最后一张显示正常图片  *  */  if(TextUtils.isEmpty(item)){  if(mImageCount <= helper.getAdapterPosition()){   imageView.setVisibility(View.GONE);   imageView2.setVisibility(View.GONE);  }else{   imageView.setVisibility(View.GONE);   imageView2.setVisibility(View.VISIBLE);   imageView2.setOnClickListener(new OnClickListener() {   @Override   public void onClick(View v) {    if (null != mAddClick) {    mAddClick.onAdd();    }   }   });  }  }else{  imageView.setVisibility(View.VISIBLE);  imageView2.setVisibility(View.GONE);  Glide.with(mContext).load(item).into(imageView);  }  imageView.setAlpha(1f); } } /** * 拖拽监听 */ private class DragAndSwipeCallback extends ItemDragAndSwipeCallback { private DragAndSwipeCallback(BaseItemDraggableAdapter adapter) {  super(adapter); } @Override public boolean canDropOver(@NonNull RecyclerView recyclerView, @NonNull RecyclerView.ViewHolder current, @NonNull RecyclerView.ViewHolder target) {  if (target.getAdapterPosition() == mDraggableAdapter.getData().size() - 1 || current.getAdapterPosition() == mDraggableAdapter.getData().size() - 1) {  return false;  }  return super.canDropOver(recyclerView, current, target); } @Override public void onSelectedChanged(RecyclerView.ViewHolder viewHolder, int actionState) {  super.onSelectedChanged(viewHolder, actionState);  if (actionState == ACTION_STATE_IDLE) {  //空闲状态  if (isDel) {   isDel = false;   tempImageDel = true;   mFrameLayout.removeView(mTempImage);  }  } } @Override public void onChildDrawOver(@NonNull Canvas c, @NonNull RecyclerView recyclerView, @NonNull RecyclerView.ViewHolder viewHolder, float dX, float dY, int actionState, boolean isCurrentlyActive) {  super.onChildDrawOver(c, recyclerView, viewHolder, dX, dY, actionState, isCurrentlyActive);  if (tempImageDel) {  return;  }  ImageView tempImageView = viewHolder.itemView.findViewById(R.id.image);  boolean b = tempImageView.getGlobalVisibleRect(rect);  Log.e("TAG", "dX:" + dX);  Log.e("TAG", "dY:" + dY);  if (b && dX > 0 && dY > 0) {  mTempImage.setX(rect.left);  mTempImage.setY(rect.top - mFixH);  } else {  mTempImage.setX(lastRect.left + dX);  mTempImage.setY(lastRect.top - mFixH + dY);  }  mTempImage.getGlobalVisibleRect(rect);  if (SCREEN_H - bottomViewH < rect.bottom) {  isDel = true;  trash.setBackgroundResource(R.drawable.base_trash_open);  } else {  isDel = false;  trash.setBackgroundResource(R.drawable.base_trash_close);  } } } public void addData(String path) { mDraggableAdapter.addData(0, path); mDraggableAdapter.notifyItemChanged(mDraggableAdapter.getData().size()-1); } public void addData(List path){ int size = mDraggableAdapter.getData().size(); int offset = mImageCount - size + 1; if(offset > path.size()){  offset = path.size(); } mDraggableAdapter.addData(0, path.subList(0,offset)); mDraggableAdapter.notifyItemChanged(mDraggableAdapter.getData().size() -1); } public void setImageCount(int mImageCount) { this.mImageCount = mImageCount; } public void setAddClick(AddClick mAddClick) { this.mAddClick = mAddClick; } public void setDragCallBack(DragCallBack mDragCallBack) { this.mDragCallBack = mDragCallBack; } /** * 获取列表 * * @return */ public List getData() { List res = new LinkedList<>(); for (int i = 0; i < mDraggableAdapter.getData().size() - 1; i++) {  res.add(mDraggableAdapter.getData().get(i)); } return res; } /** * 底部进入 */ private void in() { mBottomView.setVisibility(View.VISIBLE); ObjectAnimator animator = ObjectAnimator.ofFloat(mBottomView, "translationY", 0)  .setDuration(200); animator.start(); } /** * 底部移除屏幕外部 */ private void out() { final int moveX = DisplayUtil.dpToPx(55); ObjectAnimator animator = ObjectAnimator.ofFloat(mBottomView, "translationY", moveX)  .setDuration(200); animator.addListener(new AnimatorListenerAdapter() {  @Override  public void onAnimationEnd(Animator animation) {  super.onAnimationEnd(animation);  mBottomView.setVisibility(View.GONE);  trash.setBackgroundResource(R.drawable.base_trash_close);  } }); animator.start(); } public interface AddClick { void onAdd(); } public interface DragCallBack{ void onStart(); void onEnd(); }}

iamge_item.xml

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文章题目：Android如何仿微信发动态九宫格拖拽、删除功能
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