自定义可以来回拖拽的控件，通过拖拽改变图片顺序

首先穿件一个ReportBaseCell

package com.ankoninc.esdiagnose.view;import android.content.Context;import android.content.res.TypedArray;import android.util.AttributeSet;import android.view.View;import android.widget.LinearLayout;import android.widget.TextView;import com.ankoninc.esdiagnose.R;public class ReportBaseCell extends LinearLayout {    private TextView mTitleView;    private WrappedButton mButton;    private String mTitle;    public ReportBaseCell(Context context) {        this(context, null);    }    public ReportBaseCell(Context context, AttributeSet attrs) {        this(context, attrs, 0);    }    public ReportBaseCell(Context context, AttributeSet attrs, int defStyleAttr) {        super(context, attrs, defStyleAttr);        TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.ReportCellItem);        if (a != null) {            mTitle = a.getString(R.styleable.ReportCellItem_reportTitleText);            a.recycle();        }        setupViews(context);    }    private void setupViews(Context context) {        setOrientation(VERTICAL);        View titleContainer = inflate(context, R.layout.report_cell_title, this);        mTitleView = (TextView) titleContainer.findViewById(R.id.title);        mTitleView.setText(mTitle);        mButton = (WrappedButton) titleContainer.findViewById(R.id.button);    }    public void setTitle(int resId) {        mTitleView.setText(resId);    }    public void setTitle(String text) {        mTitleView.setText(text);    }    public void setButtonText(int resId) {        mButton.setText(resId);    }    public void setButtonText(String text) {        mButton.setText(text);    }    public void setButtonClickListener(OnClickListener listener) {        mButton.setOnClickListener(listener);    }    public void setButtonVisibility(boolean visible) {        mButton.setVisibility(visible ? VISIBLE : GONE);    }}

第二步：

package com.ankoninc.esdiagnose.view;import android.content.Context;import android.graphics.Point;import android.graphics.PointF;import android.support.v7.widget.GridLayoutManager;import android.support.v7.widget.RecyclerView;import android.util.AttributeSet;import android.view.GestureDetector;import android.view.MotionEvent;import android.view.View;import android.widget.TextView;import com.ankoninc.data.MedicalExamination;import com.ankoninc.esdiagnose.R;import com.ankoninc.esdiagnose.report.DragManager;import com.ankoninc.esdiagnose.report.DragState;import com.ankoninc.esdiagnose.report.ReportImageAdapter;import com.ankoninc.imageview.model.DownloadResult;import com.ankoninc.imageview.model.ImageDiagnoseItem;import com.ankoninc.utils.Log;import java.util.List;/** * 报告图片的，item之间可移动交换 * Created by zengna on 2016/6/8. */public class ReportImageCell extends ReportBaseCell implements RecyclerView.OnItemTouchListener, ReportImageAdapter.ImageDragListener {    private static final String LOG_TAG = "ReportImageCell";    private TextView mNotifyView;    private RecyclerView mImageContainer;    private ReportImageAdapter mAdapter;    private GridLayoutManager mLayoutManager;    private DragManager dragManager;    private final PointF dragTouchPoint = new PointF();    private MedicalExamination mPatientExamination;    private DownloadResult mDownloadResult;    private ImageListener mImageListener;    private GestureDetector mGestureDetector;    public ReportImageCell(Context context) {        this(context, null);    }    public ReportImageCell(Context context, AttributeSet attrs) {        this(context, attrs, 0);    }    public ReportImageCell(Context context, AttributeSet attrs, int defStyleAttr) {        super(context, attrs, defStyleAttr);        setupViews(context);        init(context);    }    private void setupViews(Context context) {        setTitle(R.string.report_examination_image);        setButtonText(R.string.finish);        setOnClickListener(new OnClickListener() {            @Override            public void onClick(View v) {                mAdapter.switchMode(false);            }        });        setButtonVisibility(false);        View view = inflate(context, R.layout.report_image_cell, this);        mNotifyView = (TextView) view.findViewById(R.id.image_diagnose_notify);        mImageContainer = (RecyclerView) view.findViewById(R.id.report_image_container);    }    private void init(Context context) {        updateNotify();        mGestureDetector = new GestureDetector(context, new GestureDetector.SimpleOnGestureListener() {            @Override            public boolean onDown(MotionEvent e) {                Log.d(LOG_TAG, "onDown");                View itemView  = mImageContainer.findChildViewUnder(e.getX(),e.getY());                return super.onDown(e);            }            @Override            public boolean onSingleTapConfirmed(MotionEvent e) {                Log.d(LOG_TAG, "onSingleTapConfirmed");                onItemTouched(mImageContainer, e);                return super.onSingleTapConfirmed(e);            }            @Override            public boolean onDoubleTap(MotionEvent e) {                Log.d(LOG_TAG, "onDoubleTap");                onItemTouched(mImageContainer, e);                return super.onDoubleTap(e);            }            @Override            public void onLongPress(MotionEvent e) {                Log.d(LOG_TAG, "onLongPress");                super.onLongPress(e);            }            @Override            public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX, float distanceY) {                return super.onScroll(e1, e2, distanceX, distanceY);            }        });        mAdapter = new ReportImageAdapter(this, mPatientExamination, mDownloadResult,this);        mLayoutManager = new GridLayoutManager(context, 2, VERTICAL, false);        mImageContainer.setLayoutManager(mLayoutManager);        mImageContainer.setAdapter(mAdapter);        mImageContainer.addOnItemTouchListener(this);        dragManager = new DragManager(mImageContainer, mAdapter);        dragManager.setCanDrag(true);        mImageContainer.setOnDragListener(dragManager);    }    public void updateNotify() {            //捕获图片数量        int capturedImagesCount = 0;            //选中图片的数量        int selectedImagesCount = 0;        if (mDownloadResult != null) {            List<ImageDiagnoseItem> items = mDownloadResult.findCapturedItems();            if (items != null) {                capturedImagesCount = items.size();                List<ImageDiagnoseItem> selectedImages = DownloadResult.findSelectedImages(items);                selectedImagesCount = selectedImages == null ? 0 : selectedImages.size();            }        }        if (selectedImagesCount > 0) {            mNotifyView.setText(getContext().getString(R.string.report_diagnose_notify_text, capturedImagesCount, selectedImagesCount));        } else {            mNotifyView.setText(R.string.report_cannot_upload_notify);        }        if (mImageListener != null) {            mImageListener.onCountChanged(capturedImagesCount, selectedImagesCount);        }    }    public void setDownloadResult(MedicalExamination examination, DownloadResult result) {        mDownloadResult = result;        mPatientExamination = examination;        mAdapter.resetList(examination, result);        updateNotify();    }    public void refreshDownload(int startIndex, int endIndex) {        mAdapter.refreshDownload(startIndex, endIndex);    }    public void notifyItemChanged(ImageDiagnoseItem item) {        mAdapter.notifyItemChanged(item);    }    public void startSelectImage() {        if (mImageListener != null) {            mImageListener.requestSelectImage();        }    }    public void startEditImage(ImageDiagnoseItem item) {        if (mImageListener != null) {            mImageListener.requestShowEditDialog(item);        }    }    public void setImageListener(ImageListener listener) {        mImageListener = listener;    }    @Override    public boolean onInterceptTouchEvent(RecyclerView rv, MotionEvent e) {        mGestureDetector.onTouchEvent(e);        dragTouchPoint.set(e.getX(), e.getY());        return false;    }    public List<ImageDiagnoseItem> getOrderedSelectedImages() {        return mAdapter.getOrderedSelectedImages();    }    @Override    public void onTouchEvent(RecyclerView rv, MotionEvent e) {    }    @Override    public void onRequestDisallowInterceptTouchEvent(boolean disallowIntercept) {    }    private void onItemTouched(RecyclerView rv, MotionEvent e) {        View itemView = rv.findChildViewUnder(e.getX(), e.getY());        Log.d(LOG_TAG, "onItemTouched itemView: %s", itemView);        if (itemView != null) {            int position = rv.getChildAdapterPosition(itemView);            mAdapter.onItemClicked(position);        }    }    @Override    public void onStartDrag(View view, ImageDiagnoseItem item) {        if (mImageListener != null && mImageListener.allowDrag()) {            DragState dragState = new DragState(item, item.getIndex());            DragShadowBuilder dragShadowBuilder = new com.ankoninc.esdiagnose.report.DragShadowBuilder(view,                    new Point(((int) (dragTouchPoint.x - view.getX())), (int) (dragTouchPoint.y - view.getY())));            Point shadowSize = new Point();            Point shadowTouchPoint = new Point();            dragShadowBuilder.onProvideShadowMetrics(shadowSize, shadowTouchPoint);            view.startDrag(null, dragShadowBuilder, dragState, 0);        }    }    public interface ImageListener {        boolean allowDrag();        void onCountChanged(int capturedImagesCount, int selectedImagesCount);        void requestSelectImage();        void requestShowEditDialog(ImageDiagnoseItem item);    }}

3、创建adapter

package com.ankoninc.esdiagnose.report;import android.content.Context;import android.graphics.Bitmap;import android.graphics.BitmapFactory;import android.support.v7.widget.RecyclerView;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.ImageView;import com.ankoninc.data.ADVData;import com.ankoninc.data.MedicalExamination;import com.ankoninc.esdiagnose.AppContext;import com.ankoninc.esdiagnose.R;import com.ankoninc.esdiagnose.view.ReportImageCell;import com.ankoninc.imageview.DragImageView;import com.ankoninc.imageview.model.DownloadResult;import com.ankoninc.imageview.model.ImageDiagnoseItem;import com.ankoninc.utils.Log;import java.util.List;/** * Created by zengna on 2016/6/8. */public class ReportImageAdapter extends RecyclerView.Adapter<ReportImageAdapter.ImageViewHolder> implements DragListener{    private static final String LOG_TAG = "ReportImageAdapter";    private static final int TYPE_DEFAULT = 0;    private static final int TYPE_ADD = 1;    private static final int TYPE_DELETE = 2;    private Context mContext;    private ReportImageCell mTargetView;    private MedicalExamination mPatientExamination;    private boolean mEditMode;    private List<ImageDiagnoseItem> mList;    private Bitmap mLoadingBitmap;    private ImageDragListener mListener;    private int dragItemId = DragListener.NO_ID;    public ReportImageAdapter(ReportImageCell targetView, MedicalExamination examination,                              DownloadResult downloadResult, ImageDragListener listener) {        mContext = targetView.getContext();        mTargetView = targetView;        mListener = listener;        resetList(examination, downloadResult);        BitmapFactory.Options options = new BitmapFactory.Options();        options.inSampleSize = 2;        mLoadingBitmap = BitmapFactory.decodeResource(mContext.getResources(), R.drawable.loading, options);    }    public void resetList(MedicalExamination examination, DownloadResult downloadResult) {        mPatientExamination = examination;        if (downloadResult != null) {            mList = downloadResult.getOrderedSelectedImagesByRemarks();        }        notifyDataSetChanged();    }    /**     * 更新是否下载的标志     * @param startIndex     * @param endIndex     */    public void refreshDownload(int startIndex, int endIndex) {        int count = getItemCount() - 2;        if (count <= 0) {            return;        }        // 因为有前后方向，所以重新定义start，end        int start = Math.min(startIndex, endIndex);        int end = Math.max(startIndex, endIndex);        int validStart = Math.max(0, start);        int validEnd = Math.min(end, count - 1);        for (int i=validStart; i<=validEnd; i++) {            ImageDiagnoseItem item = getItem(i);            if (item == null) {                continue;            }            item.setDownloaded(true);            notifyItemChanged(i);        }    }    public boolean isEditMode() {        return mEditMode;    }    public void switchMode(boolean editMode) {        if (editMode == mEditMode) {            return;        }        mEditMode = editMode;        notifyDataSetChanged();        mTargetView.setButtonVisibility(editMode);    }    private void startSelectImage() {        mTargetView.startSelectImage();    }    private void startEditImage(int position) {        ImageDiagnoseItem item = getItem(position);        if (item == null || !item.isDownloaded()) {            return;        }        mTargetView.startEditImage(item);    }    public boolean onItemClicked(int position) {        if (position < 0 || position >= getItemCount()) {            return false;        }        int viewType = getItemViewType(position);        switch (viewType) {            case TYPE_ADD:                if (mEditMode) {                    switchMode(false);                } else {                    startSelectImage();                }                break;            case TYPE_DELETE:                switchMode(!mEditMode);                break;            case TYPE_DEFAULT:            default:                if (mEditMode) {                    remove(position);                } else {                    startEditImage(position);                }                break;        }        return true;    }    public void notifyItemChanged(ImageDiagnoseItem item) {        if (mList == null || mList.isEmpty()) {            return;        }        int position = mList.indexOf(item);        if (position == -1) {            return;        }        notifyItemChanged(position);    }    /**     *     * @return     */    public List<ImageDiagnoseItem> getOrderedSelectedImages() {        return mList;    }    @Override    public ImageViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {        View view = LayoutInflater.from(mContext).inflate(R.layout.report_image_item, parent, false);        return new ImageViewHolder(view, new ImageViewHolder.OnLongClickListener() {            @Override            public void onLongClick(View view, int position) {                ImageDiagnoseItem item = getItem(position);                if (getItemViewType(position) == TYPE_DEFAULT && item != null) {                    mListener.onStartDrag(view, item);                }            }        });    }    @Override    public void onBindViewHolder(ImageViewHolder holder, int position) {        int viewType = getItemViewType(position);        ImageDiagnoseItem item = getItem(position);        Bitmap bitmap = null;        if (item != null && item.isDownloaded()) {            String patientName = mPatientExamination.getPatientName();            ADVData.ImageInfo imageInfo = ADVData.getImageAt(mPatientExamination.getRecordUid(),                    patientName, item.getFileNo(), item.getOffset());            if (imageInfo != null && imageInfo.image != null) {                bitmap = DragImageView.drawMarkImage(imageInfo.image, item.getPointInfos());            }        }        holder.bind(bitmap == null ? mLoadingBitmap : bitmap, mEditMode, viewType);    }    @Override    public int getItemViewType(int position) {        int count = getItemCount();        if (position == count-1) {            return TYPE_DELETE;        } else if (position == count-2) {            return TYPE_ADD;        } else {            return TYPE_DEFAULT;        }    }    @Override    public int getItemCount() {        int count = mList == null ? 0 : mList.size();        return count + 2;    }    public ImageDiagnoseItem getItem(int position) {        if (position >=0 && position < mList.size()) {            return mList.get(position);        }        return null;    }    /**     * 删除某张图片     * @param position     */    public boolean remove(int position) {        ImageDiagnoseItem item = getItem(position);        if (item != null) {            item.setSelected(false);            item.setImageOrder(0);            mList.remove(position);            mTargetView.updateNotify();            notifyItemRemoved(position);            return true;        }        return false;    }    @Override    public boolean onMoveItem(int fromPosition, int toPosition) {        if (getItemViewType(toPosition) != TYPE_DEFAULT                && getItemViewType(fromPosition) != getItemViewType(toPosition)) {            return false;        }        mList.add(toPosition, mList.remove(fromPosition));        notifyItemMoved(fromPosition, toPosition);        return true;    }    @Override    public void notifyItemChange(int position, int dragItemId) {        this.dragItemId = dragItemId;        notifyItemChanged(position);    }    @Override    public int getPosition(Object object) {        return mList.indexOf(object);    }    @Override    public void onDragEnd(int position) {    }    static class ImageViewHolder extends RecyclerView.ViewHolder implements View.OnLongClickListener{        private View mImageContainer;        private ImageView mImage;        private ImageView mDeleteButton;        private OnLongClickListener mListener;        public ImageViewHolder(View view, OnLongClickListener listener) {            super(view);            mImageContainer = view.findViewById(R.id.container);            mImage = (ImageView) view.findViewById(R.id.image);            mDeleteButton = (ImageView) view.findViewById(R.id.delete);            mListener = listener;            this.itemView.setOnLongClickListener(this);        }        public void bind(final Bitmap bitmap, final boolean editMode, final int viewType) {            switch (viewType) {                case TYPE_ADD:                    bindAddButton(editMode);                    break;                case TYPE_DELETE:                    bindDeleteButton(editMode);                    break;                default:                    bindImage(bitmap, editMode);            }        }        private void bindImage(final Bitmap bitmap, final boolean editMode) {            mImage.setImageBitmap(bitmap);            mDeleteButton.setVisibility(editMode ? View.VISIBLE : View.INVISIBLE);            mImageContainer.setBackground(AppContext.getInstance().getResources().getDrawable(R.drawable.report_image_background));        }        private void bindAddButton(final boolean editMode) {            mDeleteButton.setVisibility(View.GONE);            mImage.setImageResource(R.drawable.report_image_add);            mImageContainer.setBackground(AppContext.getInstance().getResources().getDrawable(R.drawable.report_image_button_background));            itemView.setVisibility(editMode ? View.INVISIBLE : View.VISIBLE);        }        private void bindDeleteButton(final boolean editMode) {            mDeleteButton.setVisibility(View.GONE);            mImage.setImageResource(R.drawable.report_image_delete);            mImageContainer.setBackground(AppContext.getInstance().getResources().getDrawable(R.drawable.report_image_button_background));            itemView.setVisibility(editMode ? View.INVISIBLE : View.VISIBLE);        }        @Override        public boolean onLongClick(View v) {            Log.d("ImageViewHolder", "onLongClick");            mListener.onLongClick(v, getAdapterPosition());            return true;        }        interface OnLongClickListener {            void onLongClick(View view, int position);        }    }    public interface ImageDragListener {        void onStartDrag(View view, ImageDiagnoseItem item);    }}