Android 仿微信发动态九宫格拖拽、删除功能

 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"

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<String> list = new LinkedList<>();
  for(int i = 0;i<5;i++){
   list.add("https://xx.jpg");
  }*/
  nineGridChooseImage.addData("https://xxx.jpg");
  }
 });

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
 xmlns:app="http://schemas.android.com/apk/res-auto"
 xmlns:tools="http://schemas.android.com/tools"
 android:id="@+id/frameLayout"
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 tools:context=".Main11Activity">
 <com.example.hotfix_01.view.NineGridChooseImage
 android:background="#A8A1A1"
 android:layout_marginTop="100dp"
 android:id="@+id/nineGridChooseImage"
 android:layout_width="match_parent"
 android:layout_height="wrap_content" />
</FrameLayout>

NineGridChooseImage.java
package 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<String> 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<String, BaseViewHolder> {
 private DraggableAdapter(List<String> 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<String> 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<String> getData() {
 List<String> 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();
 }
}

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 android:id="@+id/l"
 android:layout_width="wrap_content"
 android:layout_height="wrap_content" >

 <ImageView
 android:scaleType="fitXY"
 android:id="@+id/image"
 android:layout_width="149dp"
 android:layout_height="149dp" />

 <ImageView
 android:id="@+id/image2"
 android:visibility="gone"
 android:layout_width="149dp"
 android:layout_height="149dp" />
</LinearLayout>