Android实现多图选择
16lz
2021-01-26
一、技术概述
Android项目中经常会使用多图上传功能，但是Android自带的选择器只能够选择一张图片。这个选择可以适用于Android项目中的多图显示功能。
二、技术详述
布局主要是简单的RecyclerView以及一个拖动到此处删除的框
定义Adaptor工具类——GridImageAdapter
public class GridImageAdapter extends RecyclerView.Adapter { public static final String TAG = "PictureSelector"; public static final int TYPE_CAMERA = 1; public static final int TYPE_PICTURE = 2; private LayoutInflater mInflater; private List list = new ArrayList<>(); private int selectMax = 9; /** * 点击添加图片跳转 */ private onAddPicClickListener mOnAddPicClickListener; public interface onAddPicClickListener { void onAddPicClick(); } /** * 删除 */ public void delete(int position) { try { if (position != RecyclerView.NO_POSITION && list.size() > position) { list.remove(position); notifyItemRemoved(position); notifyItemRangeChanged(position, list.size()); } } catch (Exception e) { e.printStackTrace(); } } public GridImageAdapter(Context context, onAddPicClickListener mOnAddPicClickListener) { this.mInflater = LayoutInflater.from(context); this.mOnAddPicClickListener = mOnAddPicClickListener; } public void setSelectMax(int selectMax) { this.selectMax = selectMax; } public void setList(List list) { this.list = list; } public List getData() { return list == null ? new ArrayList<>() : list; } public void remove(int position) { if (list != null && position < list.size()) { list.remove(position); } } public class ViewHolder extends RecyclerView.ViewHolder { ImageView mImg; ImageView mIvDel; TextView tvDuration; public ViewHolder(View view) { super(view); mImg = view.findViewById(R.id.fiv); mIvDel = view.findViewById(R.id.iv_del); tvDuration = view.findViewById(R.id.tv_duration); } } @Override public int getItemCount() { if (list.size() < selectMax) { return list.size() + 1; } else { return list.size(); } } @Override public int getItemViewType(int position) { if (isShowAddItem(position)) { return TYPE_CAMERA; } else { return TYPE_PICTURE; } } /** * 创建ViewHolder */ @Override public ViewHolder onCreateViewHolder(ViewGroup viewGroup, int i) { View view = mInflater.inflate(R.layout.gv_filter_image, viewGroup, false); final ViewHolder viewHolder = new ViewHolder(view); return viewHolder; } private boolean isShowAddItem(int position) { int size = list.size() == 0 ? 0 : list.size(); return position == size; } /** * 设置值 */ @Override public void onBindViewHolder(final ViewHolder viewHolder, final int position) { //少于8张，显示继续添加的图标 if (getItemViewType(position) == TYPE_CAMERA) { viewHolder.mImg.setImageResource(R.drawable.ic_add_image); viewHolder.mImg.setOnClickListener(v -> mOnAddPicClickListener.onAddPicClick()); viewHolder.mIvDel.setVisibility(View.INVISIBLE); } else { viewHolder.mIvDel.setVisibility(View.VISIBLE); viewHolder.mIvDel.setOnClickListener(view -> { int index = viewHolder.getAdapterPosition(); // 这里有时会返回-1造成数据下标越界,具体可参考getAdapterPosition()源码， // 通过源码分析应该是bindViewHolder()暂未绘制完成导致，知道原因的也可联系我~感谢 if (index != RecyclerView.NO_POSITION && list.size() > index) { list.remove(index); notifyItemRemoved(index); notifyItemRangeChanged(index, list.size()); } }); LocalMedia media = list.get(position); if (media == null || TextUtils.isEmpty(media.getPath())) { return; } int chooseModel = media.getChooseModel(); String path; if (media.isCut() && !media.isCompressed()) { // 裁剪过 path = media.getCutPath(); } else if (media.isCompressed() || (media.isCut() && media.isCompressed())) { // 压缩过,或者裁剪同时压缩过,以最终压缩过图片为准 path = media.getCompressPath(); } else { // 原图 path = media.getPath(); } Log.i(TAG, "原图地址::" + media.getPath()); if (media.isCut()) { Log.i(TAG, "裁剪地址::" + media.getCutPath()); } if (media.isCompressed()) { Log.i(TAG, "压缩地址::" + media.getCompressPath()); Log.i(TAG, "压缩后文件大小::" + new File(media.getCompressPath()).length() / 1024 + "k"); } if (!TextUtils.isEmpty(media.getAndroidQToPath())) { Log.i(TAG, "Android Q特有地址::" + media.getAndroidQToPath()); } if (media.isOriginal()) { Log.i(TAG, "是否开启原图功能::" + true); Log.i(TAG, "开启原图功能后地址::" + media.getOriginalPath()); } long duration = media.getDuration(); viewHolder.tvDuration.setVisibility(PictureMimeType.isHasVideo(media.getMimeType()) ? View.VISIBLE : View.GONE); if (chooseModel == PictureMimeType.ofAudio()) { viewHolder.tvDuration.setVisibility(View.VISIBLE); viewHolder.tvDuration.setCompoundDrawablesRelativeWithIntrinsicBounds (R.drawable.picture_icon_audio, 0, 0, 0); } else { viewHolder.tvDuration.setCompoundDrawablesRelativeWithIntrinsicBounds (R.drawable.picture_icon_video, 0, 0, 0); } viewHolder.tvDuration.setText(DateUtils.formatDurationTime(duration)); if (chooseModel == PictureMimeType.ofAudio()) { viewHolder.mImg.setImageResource(R.drawable.picture_audio_placeholder); } else { Glide.with(viewHolder.itemView.getContext()) .load(PictureMimeType.isContent(path) && !media.isCut() && !media.isCompressed() ? Uri.parse(path) : path) .centerCrop() .placeholder(R.color.app_color_f6) .diskCacheStrategy(DiskCacheStrategy.ALL) .into(viewHolder.mImg); } //itemView 的点击事件 if (mItemClickListener != null) { viewHolder.itemView.setOnClickListener(v -> { int adapterPosition = viewHolder.getAdapterPosition(); mItemClickListener.onItemClick(v, adapterPosition); }); } if (mItemLongClickListener != null) { viewHolder.itemView.setOnLongClickListener(v -> { int adapterPosition = viewHolder.getAdapterPosition(); mItemLongClickListener.onItemLongClick(viewHolder, adapterPosition, v); return true; }); } } } private OnItemClickListener mItemClickListener; public void setOnItemClickListener(OnItemClickListener l) { this.mItemClickListener = l; } private OnItemLongClickListener mItemLongClickListener; public void setItemLongClickListener(OnItemLongClickListener l) { this.mItemLongClickListener = l; }} 定义获取图片缓存工具类——ImageCacheUtils
public class ImageCacheUtils { /** * 根据url获取图片缓存 * Glide 4.x请调用此方法 * 注意：此方法必须在子线程中进行 * * @param context * @param url * @return */ public static File getCacheFileTo4x(Context context, String url) { try { return Glide.with(context).downloadOnly().load(url).submit().get(); } catch (Exception e) { e.printStackTrace(); return null; } } /** * 根据url获取图片缓存 * Glide 3.x请调用此方法 * 注意：此方法必须在子线程中进行 * * @param context * @param url * @return */ public static File getCacheFileTo3x(Context context, String url) { try { return Glide.with(context).load(url).downloadOnly(Target.SIZE_ORIGINAL, Target.SIZE_ORIGINAL).get(); } catch (Exception e) { e.printStackTrace(); return null; } }}定义Glide引擎工具类——GlideEngine
public class GlideEngine implements ImageEngine { /** * 加载图片 * * @param context * @param url * @param imageView */ @Override public void loadImage(@NonNull Context context, @NonNull String url, @NonNull ImageView imageView) { Glide.with(context) .load(url) .into(imageView); } /** * 加载网络图片适配长图方案 * # 注意：此方法只有加载网络图片才会回调 * * @param context * @param url * @param imageView * @param longImageView * @param callback 网络图片加载回调监听 {link after version 2.5.1 Please use the #OnImageCompleteCallback#} */ @Override public void loadImage(@NonNull Context context, @NonNull String url, @NonNull final ImageView imageView, final SubsamplingScaleImageView longImageView, final OnImageCompleteCallback callback) { Glide.with(context) .asBitmap() .load(url) .into(new ImageViewTarget(imageView) { @Override public void onLoadStarted(@Nullable Drawable placeholder) { super.onLoadStarted(placeholder); if (callback != null) { callback.onShowLoading(); } } @Override public void onLoadFailed(@Nullable Drawable errorDrawable) { super.onLoadFailed(errorDrawable); if (callback != null) { callback.onHideLoading(); } } @Override protected void setResource(@Nullable Bitmap resource) { if (callback != null) { callback.onHideLoading(); } if (resource != null) { boolean eqLongImage = MediaUtils.isLongImg(resource.getWidth(), resource.getHeight()); longImageView.setVisibility(eqLongImage ? View.VISIBLE : View.GONE); imageView.setVisibility(eqLongImage ? View.GONE : View.VISIBLE); if (eqLongImage) { // 加载长图 longImageView.setQuickScaleEnabled(true); longImageView.setZoomEnabled(true); longImageView.setPanEnabled(true); longImageView.setDoubleTapZoomDuration(100); longImageView.setMinimumScaleType(SubsamplingScaleImageView.SCALE_TYPE_CENTER_CROP); longImageView.setDoubleTapZoomDpi(SubsamplingScaleImageView.ZOOM_FOCUS_CENTER); longImageView.setImage(ImageSource.bitmap(resource), new ImageViewState(0, new PointF(0, 0), 0)); } else { // 普通图片 imageView.setImageBitmap(resource); } } } }); } /** * 加载网络图片适配长图方案 * # 注意：此方法只有加载网络图片才会回调 * * @param context * @param url * @param imageView * @param longImageView * @ 已废弃 */ @Override public void loadImage(@NonNull Context context, @NonNull String url, @NonNull final ImageView imageView, final SubsamplingScaleImageView longImageView) { Glide.with(context) .asBitmap() .load(url) .into(new ImageViewTarget(imageView) { @Override protected void setResource(@Nullable Bitmap resource) { if (resource != null) { boolean eqLongImage = MediaUtils.isLongImg(resource.getWidth(), resource.getHeight()); longImageView.setVisibility(eqLongImage ? View.VISIBLE : View.GONE); imageView.setVisibility(eqLongImage ? View.GONE : View.VISIBLE); if (eqLongImage) { // 加载长图 longImageView.setQuickScaleEnabled(true); longImageView.setZoomEnabled(true); longImageView.setPanEnabled(true); longImageView.setDoubleTapZoomDuration(100); longImageView.setMinimumScaleType(SubsamplingScaleImageView.SCALE_TYPE_CENTER_CROP); longImageView.setDoubleTapZoomDpi(SubsamplingScaleImageView.ZOOM_FOCUS_CENTER); longImageView.setImage(ImageSource.bitmap(resource), new ImageViewState(0, new PointF(0, 0), 0)); } else { // 普通图片 imageView.setImageBitmap(resource); } } } }); } /** * 加载相册目录 * * @param context 上下文 * @param url 图片路径 * @param imageView 承载图片ImageView */ @Override public void loadFolderImage(@NonNull final Context context, @NonNull String url, @NonNull final ImageView imageView) { Glide.with(context) .asBitmap() .load(url) .override(180, 180) .centerCrop() .sizeMultiplier(0.5f) .apply(new RequestOptions().placeholder(R.drawable.picture_image_placeholder)) .into(new BitmapImageViewTarget(imageView) { @Override protected void setResource(Bitmap resource) { RoundedBitmapDrawable circularBitmapDrawable = RoundedBitmapDrawableFactory. create(context.getResources(), resource); circularBitmapDrawable.setCornerRadius(8); imageView.setImageDrawable(circularBitmapDrawable); } }); } /** * 加载gif * * @param context 上下文 * @param url 图片路径 * @param imageView 承载图片ImageView */ @Override public void loadAsGifImage(@NonNull Context context, @NonNull String url, @NonNull ImageView imageView) { Glide.with(context) .asGif() .load(url) .into(imageView); } /** * 加载图片列表图片 * * @param context 上下文 * @param url 图片路径 * @param imageView 承载图片ImageView */ @Override public void loadGridImage(@NonNull Context context, @NonNull String url, @NonNull ImageView imageView) { Glide.with(context) .load(url) .override(200, 200) .centerCrop() .apply(new RequestOptions().placeholder(R.drawable.picture_image_placeholder)) .into(imageView); } private GlideEngine() { } private static GlideEngine instance; public static GlideEngine createGlideEngine() { if (null == instance) { synchronized (GlideEngine.class) { if (null == instance) { instance = new GlideEngine(); } } } return instance; }} 最后一个工具类FullyGridLayoutManager
public class FullyGridLayoutManager extends GridLayoutManager { public FullyGridLayoutManager(Context context, int spanCount) { super(context, spanCount); } public FullyGridLayoutManager(Context context, int spanCount, int orientation, boolean reverseLayout) { super(context, spanCount, orientation, reverseLayout); } private int[] mMeasuredDimension = new int[2]; @Override public void onMeasure(RecyclerView.Recycler recycler, RecyclerView.State state, int widthSpec, int heightSpec) { final int widthMode = View.MeasureSpec.getMode(widthSpec); final int heightMode = View.MeasureSpec.getMode(heightSpec); final int widthSize = View.MeasureSpec.getSize(widthSpec); final int heightSize = View.MeasureSpec.getSize(heightSpec); int width = 0; int height = 0; int count = getItemCount(); int span = getSpanCount(); for (int i = 0; i < count; i++) { measureScrapChild(recycler, i, View.MeasureSpec.makeMeasureSpec(i, View.MeasureSpec.UNSPECIFIED), View.MeasureSpec.makeMeasureSpec(i, View.MeasureSpec.UNSPECIFIED), mMeasuredDimension); if (getOrientation() == HORIZONTAL) { if (i % span == 0) { width = width + mMeasuredDimension[0]; } if (i == 0) { height = mMeasuredDimension[1]; } } else { if (i % span == 0) { height = height + mMeasuredDimension[1]; } if (i == 0) { width = mMeasuredDimension[0]; } } } switch (widthMode) { case View.MeasureSpec.EXACTLY: width = widthSize; case View.MeasureSpec.AT_MOST: case View.MeasureSpec.UNSPECIFIED: } switch (heightMode) { case View.MeasureSpec.EXACTLY: height = heightSize; case View.MeasureSpec.AT_MOST: case View.MeasureSpec.UNSPECIFIED: } setMeasuredDimension(width, height); } final RecyclerView.State mState = new RecyclerView.State(); private void measureScrapChild(RecyclerView.Recycler recycler, int position, int widthSpec, int heightSpec, int[] measuredDimension) { int itemCount = mState.getItemCount(); if (position < itemCount) { try { View view = recycler.getViewForPosition(0); if (view != null) { RecyclerView.LayoutParams p = (RecyclerView.LayoutParams) view.getLayoutParams(); int childWidthSpec = ViewGroup.getChildMeasureSpec(widthSpec, getPaddingLeft() + getPaddingRight(), p.width); int childHeightSpec = ViewGroup.getChildMeasureSpec(heightSpec, getPaddingTop() + getPaddingBottom(), p.height); view.measure(childWidthSpec, childHeightSpec); measuredDimension[0] = view.getMeasuredWidth() + p.leftMargin + p.rightMargin; measuredDimension[1] = view.getMeasuredHeight() + p.bottomMargin + p.topMargin; recycler.recycleView(view); } } catch (Exception e) { e.printStackTrace(); } } }}做好以上工具类的创建后，就可以开始搭建图片选择器了
首先初始化RecylerView以及GridImageAdapter
mRecyclerView = findViewById(R.id.publish_article_recycler); FullyGridLayoutManager manager = new FullyGridLayoutManager(this, 4, GridLayoutManager.VERTICAL, false); mRecyclerView.setLayoutManager(manager); mRecyclerView.addItemDecoration(new GridSpacingItemDecoration(4, ScreenUtils.dip2px(this, 8), false)); mAdapter = new GridImageAdapter(getContext(), onAddPicClickListener); mAdapter.setSelectMax(maxSelectNum);给adaptor添加点击事件
mAdapter.setOnItemClickListener((v, position) -> { List selectList = mAdapter.getData(); if (selectList.size() > 0) { LocalMedia media = selectList.get(position); String mimeType = media.getMimeType(); int mediaType = PictureMimeType.getMimeType(mimeType); switch (mediaType) { case PictureConfig.TYPE_VIDEO: // 预览视频 PictureSelector.create(PublishArticle.this) .themeStyle(R.style.picture_default_style) .setPictureStyle(mPictureParameterStyle)// 动态自定义相册主题 .externalPictureVideo(TextUtils.isEmpty(media.getAndroidQToPath()) ? media.getPath() : media.getAndroidQToPath()); break; default: // 预览图片 可自定长按保存路径// PictureWindowAnimationStyle animationStyle = new PictureWindowAnimationStyle();// animationStyle.activityPreviewEnterAnimation = R.anim.picture_anim_up_in;// animationStyle.activityPreviewExitAnimation = R.anim.picture_anim_down_out; PictureSelector.create(PublishArticle.this) .themeStyle(R.style.picture_default_style) // xml设置主题 .setPictureStyle(mPictureParameterStyle)// 动态自定义相册主题 //.setPictureWindowAnimationStyle(animationStyle)// 自定义页面启动动画 .setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_UNSPECIFIED)// 设置相册Activity方向，不设置默认使用系统 .isNotPreviewDownload(true)// 预览图片长按是否可以下载 //.bindCustomPlayVideoCallback(new MyVideoSelectedPlayCallback(getContext()))// 自定义播放回调控制，用户可以使用自己的视频播放界面 .imageEngine(GlideEngine.createGlideEngine())// 外部传入图片加载引擎，必传项 .openExternalPreview(position, selectList); break; } }});mAdapter.setItemLongClickListener((holder, position, v) -> { //如果item不是最后一个，则执行拖拽 needScaleBig = true; needScaleSmall = true; int size = mAdapter.getData().size(); if (size != maxSelectNum) { mItemTouchHelper.startDrag(holder); return; } if (holder.getLayoutPosition() != size - 1) { mItemTouchHelper.startDrag(holder); }});mRecyclerView.setAdapter(mAdapter);mDragListener = new DragListener() { @Override public void deleteState(boolean isDelete) { if (isDelete) { tvDeleteText.setText(getString(R.string.app_let_go_drag_delete)); tvDeleteText.setCompoundDrawablesRelativeWithIntrinsicBounds(0, R.drawable.ic_let_go_delete, 0, 0); } else { tvDeleteText.setText(getString(R.string.app_drag_delete)); tvDeleteText.setCompoundDrawablesRelativeWithIntrinsicBounds(0, R.drawable.picture_icon_delete, 0, 0); } } @Override public void dragState(boolean isStart) { int visibility = tvDeleteText.getVisibility(); if (isStart) { if (visibility == View.GONE) { tvDeleteText.animate().alpha(1).setDuration(300).setInterpolator(new AccelerateInterpolator()); tvDeleteText.setVisibility(View.VISIBLE); } } else { if (visibility == View.VISIBLE) { tvDeleteText.animate().alpha(0).setDuration(300).setInterpolator(new AccelerateInterpolator()); tvDeleteText.setVisibility(View.GONE); } } }}; 触摸事件的编写
mItemTouchHelper = new ItemTouchHelper(new ItemTouchHelper.Callback() { @Override public boolean isLongPressDragEnabled() { return true; } @Override public void onSwiped(@NonNull RecyclerView.ViewHolder viewHolder, int direction) { } @Override public int getMovementFlags(@NonNull RecyclerView recyclerView, @NonNull RecyclerView.ViewHolder viewHolder) { int itemViewType = viewHolder.getItemViewType(); if (itemViewType != GridImageAdapter.TYPE_CAMERA) { viewHolder.itemView.setAlpha(0.7f); } return makeMovementFlags(ItemTouchHelper.DOWN | ItemTouchHelper.UP | ItemTouchHelper.LEFT | ItemTouchHelper.RIGHT, 0); } @Override public boolean onMove(@NonNull RecyclerView recyclerView, @NonNull RecyclerView.ViewHolder viewHolder, @NonNull RecyclerView.ViewHolder target) { //得到item原来的position try { int fromPosition = viewHolder.getAdapterPosition(); //得到目标position int toPosition = target.getAdapterPosition(); int itemViewType = target.getItemViewType(); if (itemViewType != GridImageAdapter.TYPE_CAMERA) { if (fromPosition < toPosition) { for (int i = fromPosition; i < toPosition; i++) { Collections.swap(mAdapter.getData(), i, i + 1); } } else { for (int i = fromPosition; i > toPosition; i--) { Collections.swap(mAdapter.getData(), i, i - 1); } } mAdapter.notifyItemMoved(fromPosition, toPosition); } } catch (Exception e) { e.printStackTrace(); } return true; } @Override public void onChildDraw(@NonNull Canvas c, @NonNull RecyclerView recyclerView, @NonNull RecyclerView.ViewHolder viewHolder, float dX, float dY, int actionState, boolean isCurrentlyActive) { int itemViewType = viewHolder.getItemViewType(); if (itemViewType != GridImageAdapter.TYPE_CAMERA) { if (null == mDragListener) { return; } if (needScaleBig) { //如果需要执行放大动画 viewHolder.itemView.animate().scaleXBy(0.1f).scaleYBy(0.1f).setDuration(100); //执行完成放大动画,标记改掉 needScaleBig = false; //默认不需要执行缩小动画，当执行完成放大 并且松手后才允许执行 needScaleSmall = false; } int sh = recyclerView.getHeight() + tvDeleteText.getHeight(); int ry = tvDeleteText.getBottom() - sh; if (dY >= ry) { //拖到删除处 mDragListener.deleteState(true); if (isUpward) { //在删除处放手，则删除item viewHolder.itemView.setVisibility(View.INVISIBLE); mAdapter.delete(viewHolder.getAdapterPosition()); resetState(); return; } } else {//没有到删除处 if (View.INVISIBLE == viewHolder.itemView.getVisibility()) { //如果viewHolder不可见，则表示用户放手，重置删除区域状态 mDragListener.dragState(false); } if (needScaleSmall) {//需要松手后才能执行 viewHolder.itemView.animate().scaleXBy(1f).scaleYBy(1f).setDuration(100); } mDragListener.deleteState(false); } super.onChildDraw(c, recyclerView, viewHolder, dX, dY, actionState, isCurrentlyActive); } } @Override public void onSelectedChanged(@Nullable RecyclerView.ViewHolder viewHolder, int actionState) { int itemViewType = viewHolder != null ? viewHolder.getItemViewType() : GridImageAdapter.TYPE_CAMERA; if (itemViewType != GridImageAdapter.TYPE_CAMERA) { if (ItemTouchHelper.ACTION_STATE_DRAG == actionState && mDragListener != null) { mDragListener.dragState(true); } super.onSelectedChanged(viewHolder, actionState); } } @Override public long getAnimationDuration(@NonNull RecyclerView recyclerView, int animationType, float animateDx, float animateDy) { needScaleSmall = true; isUpward = true; return super.getAnimationDuration(recyclerView, animationType, animateDx, animateDy); } @Override public void clearView(@NonNull RecyclerView recyclerView, @NonNull RecyclerView.ViewHolder viewHolder) { int itemViewType = viewHolder.getItemViewType(); if (itemViewType != GridImageAdapter.TYPE_CAMERA) { viewHolder.itemView.setAlpha(1.0f); super.clearView(recyclerView, viewHolder); mAdapter.notifyDataSetChanged(); resetState(); } }});不要忘记绑定
// 绑定拖拽事件mItemTouchHelper.attachToRecyclerView(mRecyclerView);// 注册广播BroadcastManager.getInstance(getContext()).registerReceiver(broadcastReceiver, BroadcastAction.ACTION_DELETE_PREVIEW_POSITION);最后集成LuckSiege的PictureSelector2.0
private GridImageAdapter.onAddPicClickListener onAddPicClickListener = new GridImageAdapter.onAddPicClickListener() { @Override public void onAddPicClick() { // 进入相册 以下是例子：不需要的api可以不写 PictureSelector.create(PublishArticle.this) .openGallery(PictureMimeType.ofImage())// 全部.PictureMimeType.ofAll()、图片.ofImage()、视频.ofVideo()、音频.ofAudio() .imageEngine(GlideEngine.createGlideEngine())// 外部传入图片加载引擎，必传项 .setPictureStyle(mPictureParameterStyle)// 动态自定义相册主题 .setPictureCropStyle(mCropParameterStyle)// 动态自定义裁剪主题 .maxSelectNum(maxSelectNum)// 最大图片选择数量 .minSelectNum(1)// 最小选择数量// .isOriginalImageControl(true) .isCompress(true)// 是否压缩 .compressQuality(20)// 图片压缩后输出质量 0~ 100 .isEnableCrop(true)// 是否裁剪 .freeStyleCropEnabled(true)// 裁剪框是否可拖拽// .showCropFrame(true)// 是否显示裁剪矩形边框 圆形裁剪时建议设为false .hideBottomControls(true)// 是否显示uCrop工具栏，默认不显示 .selectionData(mAdapter.getData())// 是否传入已选图片 .imageSpanCount(4)// 每行显示个数 .isReturnEmpty(false)// 未选择数据时点击按钮是否可以返回 .setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_UNSPECIFIED)// 设置相册Activity方向，不设置默认使用系统 .forResult(new MyResultCallback(mAdapter)); } }; /** * 返回结果回调 */ private static class MyResultCallback implements OnResultCallbackListener { private WeakReference mAdapterWeakReference; public MyResultCallback(GridImageAdapter adapter) { super(); this.mAdapterWeakReference = new WeakReference<>(adapter); } @Override public void onResult(List result) { for (LocalMedia media : result) { Log.i(TAG, "是否压缩:" + media.isCompressed()); Log.i(TAG, "压缩:" + media.getCompressPath()); Log.i(TAG, "原图:" + media.getPath()); Log.i(TAG, "是否裁剪:" + media.isCut()); Log.i(TAG, "裁剪:" + media.getCutPath()); Log.i(TAG, "是否开启原图:" + media.isOriginal()); Log.i(TAG, "原图路径:" + media.getOriginalPath()); Log.i(TAG, "Android Q 特有Path:" + media.getAndroidQToPath()); Log.i(TAG, "宽高: " + media.getWidth() + "x" + media.getHeight()); Log.i(TAG, "Size: " + media.getSize()); //可以通过PictureSelectorExternalUtils.getExifInterface();方法获取一些额外的资源信息，如旋转角度、经纬度等信息 } if (mAdapterWeakReference.get() != null) { mAdapterWeakReference.get().setList(result); mAdapterWeakReference.get().notifyDataSetChanged(); } } @Override public void onCancel() { Log.i(TAG, "PictureSelector Cancel"); } } 再根据自己的需要进行一些回调接口的编写，就能大致实现一个可以多选图片并显示的activity了
三、问题与解决
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在和后端的交互过程中，因为图片大小限制的原因，我们需要对图片进行一定程度的压缩。万幸的是PictureSelector自带裁剪和压缩的功能，只需要在创建时明确自己的参数，就可以实现相关的功能了。
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拖拉功能的实现是难度比较大的。我根据的是LuckSiege的Github中所给出的demo进行修改所完成的功能，大家如果需要可以利用LuckSiege的demo进行尝试和修改。
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对于LocalMedia类型的说明，这是LuckSiege中定义的一个文件类型，可以选择音频、视频、图片等，在这个项目中，我只使用了图片的文件类型，具体的大家可以到LuckSiege的GitHub上去查看相关说明。
四、总结
集成PictureSelector2.0并不难，难的是如何对Selector所选择的图片进行相关的操作，如排序、删除、再次添加等等，大多数新手都会面对这样的问题，我集成了Selector但是我并不知道如何去保存这些数据，如何向后端传输这些数据，这些问题，都可以通过下载demo，对demo进行分析然后再根据需要，对demo进行集成，不仅解决了主要问题，还可以学习到别人的代码。
五、参考博客
LuckSiege的PictureSelector2.0
Glide的使用详解
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