Android RecyclerView设置多选

本篇文章记录如何使用recyclerView，通过适配器来实现recyclerView的多选。点击多选按钮时每个item后面会显示一个checkBox，取消时checkBox会隐藏。要点如下：

recyclerView+Adapter
自定义view的dialog
自定义的popupWindow

一、实现基本的recyclerView+Adapter

/** * Created by stephen on 17-8-12. * 文件列表recyclerView适配器 */public class RecordingsAdapter extends RecyclerView.Adapter {    private List recordingFileList;    private static List multipleFileList=new ArrayList<>();//多选选择的文件集合    private SavedRecordingsFragment s;    private boolean ifRenameClicked=false;    private boolean ifDeleteClicked=false;    private boolean ifMultipleDeleteClicked=false;    private PopupWindowRename popupWindowRename;//重命名popupWindow    private PopupWindowDelete popupWindowDelete;//确认删除popupWindow    private MultipleDeletePopup multipleBottomDialog;//多选删除popupWindow    private static final String PLAY_DIALOG="com.example.stephen.soundrecorder.action.PLAY_DIALOG";    private static final String NOTIFY_RECYCLER_VIEW="com.example.stephen.soundrecorder.action.NOTIFY_RECYCLER_VIEW";    //录音文件存储父路径    final private File fileDir=new File(Environment.getExternalStorageDirectory(),"/RecordFile");    private Dialog bottomDialog;//底部选择dialog(delete,rename,share,multiple)    private boolean ifMultiple=false;//是否多选    static class ViewHolder extends RecyclerView.ViewHolder{        TextView fileName,fileLength,fileData;        CheckBox checkBox;        View view;        public ViewHolder(View itemView) {            super(itemView);            view=itemView;            fileName=(TextView) itemView.findViewById(R.id.name_recording_file);            fileLength=(TextView)itemView.findViewById(R.id.length_recording_file);            fileData=(TextView)itemView.findViewById(R.id.data_recording_file);            checkBox=(CheckBox)itemView.findViewById(R.id.check_recording_file);        }    }    public RecordingsAdapter(List list, SavedRecordingsFragment s) {        this.recordingFileList =list;        this.s=s;    }    /**     * 按键响应,点击item播放录音     * 长按item滑出底部dialog，选择删除/重命名操作     * @param parent     * @param viewType     */    @Override    public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {        final View view= LayoutInflater.from(parent.getContext()).inflate(R.layout.recycler_item_recordings,parent,false);        final ViewHolder viewHolder=new ViewHolder(view);        viewHolder.view.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                //若在多选删除情况下，点击item选择/取消checkbox，不能播放                if (ifMultiple){                    if (viewHolder.checkBox.isChecked()){                        viewHolder.checkBox.setChecked(false);                    }else viewHolder.checkBox.setChecked(true);                    return;                }                int position = viewHolder.getAdapterPosition();                RecordingFiles recordingFiles = recordingFileList.get(position);                Gson gson=new Gson();                String recordJsonStr= gson.toJson(recordingFiles);                Intent intent = new Intent(PLAY_DIALOG);                intent.putExtra("record_json",recordJsonStr);                v.getContext().sendBroadcast(intent);            }        });        viewHolder.view.setOnLongClickListener(new View.OnLongClickListener() {            @Override            public boolean onLongClick(View v) {                if (!ifMultiple){                    longClickListener(viewHolder);                }                return true;            }        });        viewHolder.checkBox.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                int selectedPosition = viewHolder.getAdapterPosition();                RecordingFiles selectedRecordingFiles = recordingFileList.get(selectedPosition);                if (viewHolder.checkBox.isChecked()){                    //若被选中                    multipleFileList.add(selectedRecordingFiles);                }else {                    multipleFileList.remove(selectedRecordingFiles);                }            }        });        return viewHolder;    }    @Override    public void onBindViewHolder(ViewHolder holder, int position) {        RecordingFiles recordingFiles=recordingFileList.get(position);        holder.fileData.setText(recordingFiles.getFileData());        holder.fileName.setText(recordingFiles.getFileName());        holder.fileLength.setText(CalculateDurationToTime.calTime(recordingFiles.getFileLength()));        if (ifMultiple){            holder.checkBox.setVisibility(View.VISIBLE);            holder.checkBox.setChecked(false);        }else {            holder.checkBox.setVisibility(View.INVISIBLE);        }    }    @Override    public int getItemCount() {        return recordingFileList.size();    }    private View.OnClickListener itemsOnClick =new View.OnClickListener() {        @Override        public void onClick(View v) {            switch (v.getId()) {                case R.id.popup_rename_ok:                    ifRenameClicked=true;                    popupWindowRename.dismiss();                    break;                case R.id.popup_rename_cancel:                    ifRenameClicked=false;                    popupWindowRename.dismiss();                    break;                case R.id.popup_delete_ok:                    ifDeleteClicked=true;                    popupWindowDelete.dismiss();                    break;                case R.id.popup_delete_cancel:                    ifDeleteClicked=false;                    popupWindowDelete.dismiss();                    break;                case R.id.cancel_multiple_recording_file:                    multipleBottomDialog.dismiss();                    break;                case R.id.delete_multiple_recording_file:                    ifMultipleDeleteClicked=true;                    multipleBottomDialog.dismiss();                default:                    break;            }        }    };    //长按item弹出底部popuWindow    private void longClickListener(ViewHolder viewHolder){            int position = viewHolder.getAdapterPosition();            final RecordingFiles recordingFiles = recordingFileList.get(position);//选中的文件            bottomDialog=new Dialog(s.getContext(),R.style.BottomDialog);            LinearLayout root=(LinearLayout)LayoutInflater.from(s.getContext()).inflate(R.layout.bottom_dialog,null);            //初始化底部dialog视图,设置按键响应            //分享按键            root.findViewById(R.id.multiple_recording_file).setOnClickListener(new View.OnClickListener() {                @Override                public void onClick(View v) {                    multipleDeleteFile();                }            });            //分享按键            root.findViewById(R.id.share_recording_file).setOnClickListener(new View.OnClickListener() {                @Override                public void onClick(View v) {                    shareFile(new File(fileDir,recordingFiles.getFileName()));                }            });            //删除按键            root.findViewById(R.id.delete_recording_file).setOnClickListener(new View.OnClickListener() {                @Override                public void onClick(View v) {                    deleteFile(new File(fileDir,recordingFiles.getFileName()));                }            });            //重命名按键            root.findViewById(R.id.rename_recording_file).setOnClickListener(new View.OnClickListener() {                @Override                public void onClick(View v) {                    renameFile(new File(fileDir,recordingFiles.getFileName()));                }            });            bottomDialog.setContentView(root);            Window dialogWindow = bottomDialog.getWindow();            dialogWindow.setGravity(Gravity.BOTTOM);            WindowManager.LayoutParams lp = dialogWindow.getAttributes(); // 获取对话框当前的参数值            lp.x = 0; // 新位置X坐标            lp.y = 0; // 新位置Y坐标            lp.width = (int) s.getContext().getResources().getDisplayMetrics().widthPixels; // 宽度            root.measure(0, 0);            lp.height = root.getMeasuredHeight();            lp.alpha = 9f; // 透明度            dialogWindow.setAttributes(lp);            bottomDialog.show();        }    //删除多选的文件    public void multipleDeleteFile(){        bottomDialog.dismiss();//隐藏底部dialog        ifMultiple=true;//设置多选框可见        //发送广播更新recycler view        Intent intent=new Intent(NOTIFY_RECYCLER_VIEW);        s.getContext().sendBroadcast(intent);        //弹出底部删除/取消选择框        multipleBottomDialog=new MultipleDeletePopup(s.getContext(),itemsOnClick);        multipleBottomDialog.showAtLocation(s.getView(),Gravity.BOTTOM,0,0);        multipleBottomDialog.setOnDismissListener(new PopupWindow.OnDismissListener() {            @Override            public void onDismiss() {                if (ifMultipleDeleteClicked){                    for (RecordingFiles recordings:multipleFileList){                        File tempFile= new File(fileDir,recordings.getFileName());                        if (tempFile.exists())tempFile.delete();                    }                    ifMultipleDeleteClicked=false;                }                //清空multipleFileList                multipleFileList.clear();                ifMultiple=false;                //发送广播更新recycler view                Intent intent=new Intent(NOTIFY_RECYCLER_VIEW);                s.getContext().sendBroadcast(intent);            }        });    }    //分享文件    private void shareFile(File file){        bottomDialog.dismiss();//隐藏底部dialog        setWindowAlpha(0.6f);//设置背景模糊，需要使用getActivity().getWindow(),所以需要在adapter构造器中传入fragment实例        Intent shareIntent = new Intent();        shareIntent.setAction(Intent.ACTION_SEND);        shareIntent.putExtra(Intent.EXTRA_STREAM, Uri.fromFile(file));        shareIntent.setType("audio/mp4");        s.getContext().startActivity(Intent.createChooser(shareIntent,"发送至"));        setWindowAlpha(1f);    }    //删除文件    private void deleteFile(final File file){        bottomDialog.dismiss();//隐藏底部dialog        popupWindowDelete=new PopupWindowDelete(s.getContext(),itemsOnClick,file.getName());        popupWindowDelete.showAtLocation(s.getView(),Gravity.CENTER,0,0);        //设置背景模糊，需要使用getActivity().getWindow(),所以需要在adapter构造器中传入fragment实例        setWindowAlpha(0.6f);        //bottomPopupWindow消失后恢复fragment透明度        //并判断是否点击了确定按钮        //若点击了，就执行删除文件操作        popupWindowDelete.setOnDismissListener(new PopupWindow.OnDismissListener() {            @Override            public void onDismiss() {                setWindowAlpha(1f);                if (ifDeleteClicked){                    if (file.exists()){                        file.delete();                        Toast.makeText(s.getContext(),file.getName()+"文件已删除！",Toast.LENGTH_SHORT).show();                        //发送广播更新recycler view                        Intent intent=new Intent(NOTIFY_RECYCLER_VIEW);                        s.getContext().sendBroadcast(intent);                    }                    ifDeleteClicked=false;                }            }        });    }    //重命名文件    private void renameFile(final File file){        bottomDialog.dismiss();        popupWindowRename =new PopupWindowRename(s.getContext(),itemsOnClick,file.getName().substring(0,file.getName().length()-4));        popupWindowRename.showAtLocation(s.getView(),Gravity.CENTER,0,0);        //设置背景模糊，需要使用getActivity().getWindow(),所以需要在adapter构造器中传入fragment实例        setWindowAlpha(0.6f);        //bottomPopupWindow消失后恢复fragment透明度        //并判断是否点击了确定按钮        //若点击了，就执行重命名操作        popupWindowRename.setOnDismissListener(new PopupWindow.OnDismissListener() {            @Override            public void onDismiss() {                setWindowAlpha(1f);                if (ifRenameClicked){                    Log.d("RecorderAdapter",file.getAbsolutePath());                    if (file.exists()){                        Log.d("RecorderAdapter","file exist!!!");                        File renameFile=new File(fileDir, popupWindowRename.getEditText()+".mp3");                        file.renameTo(renameFile);                        //发送广播更新recycler view                        Intent intent=new Intent(NOTIFY_RECYCLER_VIEW);                        s.getContext().sendBroadcast(intent);                    }                    ifRenameClicked=false;                }            }        });    }    //设置fragment透明度    private void setWindowAlpha(float f){        WindowManager.LayoutParams lp=s.getActivity().getWindow().getAttributes();        lp.alpha = f; //0.0-1.0        s.getActivity().getWindow().setAttributes(lp);    }}

-以上是adapter的全部代码，先贴出来

二、下面详细讲解一下实现过程

首先，长按item时，会跳出一个底部dialog。既代码中的bottomDialog，这里有四个选项，分别为：多选、分享、删除和重命名。后面三个我们不去管，只看第一个多选。
点击多选按钮时，底部的bottomDialog会dimiss，这时提醒adapter刷新，所有item的checkBox会被设置称VISIBLE，且都是uncheck。具体实现在multipleDeleteFile（）函数。
我们来仔细看一下这个函数：
1.首先给变量ifMultiple赋值为true，再更新adapter
这里设置ifMultiple为true后再去加载adapter时，我们看到在onBindViewHolder（）函数里，会设置checkBox为VISIBLE，同时初始化为uncheck;

public void onBindViewHolder(ViewHolder holder, int position) {        RecordingFiles recordingFiles=recordingFileList.get(position);        holder.fileData.setText(recordingFiles.getFileData());        holder.fileName.setText(recordingFiles.getFileName());        holder.fileLength.setText(CalculateDurationToTime.calTime(recordingFiles.getFileLength()));        if (ifMultiple){            holder.checkBox.setVisibility(View.VISIBLE);            holder.checkBox.setChecked(false);        }else {            holder.checkBox.setVisibility(View.INVISIBLE);        }    }

然后在onCreateViewHolder（）函数中，设置item的点击响应事件，之前是点击就会播放这段录音，现在当ifMultiple为true时，点击item就会改变checkBox的选择状态并返回，也就是不会再播放录音来，同时长按item也不会有响应。

 @Override    public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {        final View view= LayoutInflater.from(parent.getContext()).inflate(R.layout.recycler_item_recordings,parent,false);        final ViewHolder viewHolder=new ViewHolder(view);        viewHolder.view.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                //若在多选删除情况下，点击item选择/取消checkbox，不能播放                if (ifMultiple){                    if (viewHolder.checkBox.isChecked()){                        viewHolder.checkBox.setChecked(false);                    }else viewHolder.checkBox.setChecked(true);                    return;                }                int position = viewHolder.getAdapterPosition();                RecordingFiles recordingFiles = recordingFileList.get(position);                Gson gson=new Gson();                String recordJsonStr= gson.toJson(recordingFiles);                Intent intent = new Intent(PLAY_DIALOG);                intent.putExtra("record_json",recordJsonStr);                v.getContext().sendBroadcast(intent);            }        });        viewHolder.view.setOnLongClickListener(new View.OnLongClickListener() {            @Override            public boolean onLongClick(View v) {              //若在多选删除情况下,长按item没有响应                if (!ifMultiple){                    longClickListener(viewHolder);                }                return true;            }        });        viewHolder.checkBox.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                int selectedPosition = viewHolder.getAdapterPosition();                RecordingFiles selectedRecordingFiles = recordingFileList.get(selectedPosition);                if (viewHolder.checkBox.isChecked()){                    //若被选中                    multipleFileList.add(selectedRecordingFiles);                }else {                    multipleFileList.remove(selectedRecordingFiles);                }            }        });        return viewHolder;    }

2.我们接着看multipleDeleteFile函数，接下来弹出一个底部的自定义popupWindowFragment，类似于dialog，里面有两个按钮：删除和取消。当用户选择了一定数量的item后点击删除时，执行如下代码：

if (ifMultipleDeleteClicked){     for (RecordingFiles recordings:multipleFileList){           File tempFile= new File(fileDir,recordings.getFileName());           if (tempFile.exists())tempFile.delete();     }     ifMultipleDeleteClicked=false;}

multipleFileList是一个全局变量，他会记录所有被选中的录音文件，然后在这里遍历这个list删除选中的文件。
3.最后在执行如下代码，清空list并发送广播更新recyclerView

multipleFileList.clear();                ifMultiple=false;                //发送广播更新recycler view                Intent intent=new Intent(NOTIFY_RECYCLER_VIEW);                s.getContext().sendBroadcast(intent);

Android(安卓)RecyclerView设置多选

Android RecyclerView设置多选

一、实现基本的recyclerView+Adapter

二、下面详细讲解一下实现过程

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