Android踩坑日记：监听软键盘多次调用和刷新系统相册和获取所有相片

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EditText设置监听软键盘删除键(或enter)

一般使用方法

edittext.setOnKeyListener(new View.OnKeyListener(){@Overridepublic boolean onKey(View v, int keyCode, KeyEvent event) {if (keyCode == KeyEvent.KEYCODE_DEL ){//处理操作}}
});

问题：
当点击软键盘的删除键时，处理操作会只执行两次或多次
爬坑姿势：

edittext.setOnKeyListener(new View.OnKeyListener(){@Overridepublic boolean onKey(View v, int keyCode, KeyEvent event) {/*必须是这两个条件，否则会执行多次*/if (keyCode == KeyEvent.KEYCODE_DEL && event.getAction()==KeyEvent.ACTION_DOWN){//处理操作}}
});

刷新系统相册

当我们在系统的相册中增加或者删除图片，需要再次获取系统相册的所有图片时，需要通知系统刷新一下系统相册

/*通知系统刷新相册*/public static void noticeSystemRefreshAlbum(Context context,String path){Intent mediaScanIntent=new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE);Uri uri=null;if (path!=null){uri= Uri.fromFile(new File(path));}mediaScanIntent.setData(uri);mediaScanIntent = PermissionUtil.getUriAuthority(mediaScanIntent);context.sendBroadcast(mediaScanIntent);}public static Intent getUriAuthority(Intent intent) {//对于android M及更高版本，intent需要提供URI相关权限以操作文件//文件uri需要通过FileProvider获取if (Build.VERSION.SDK_INT > Build.VERSION_CODES.M) {intent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);intent.addFlags(Intent.FLAG_GRANT_WRITE_URI_PERMISSION);}return intent;}

获取系统所有图片和按相册名分类

/*本地相片文件描述类*/
public class LocalPhotoBean implements Serializable{/** 系统数据库中的id */public long mediaId;/*文件名*/public String fileName;/*文件路径*/public String path;/*缩略图路径*/public String thumbNailPath;/*文件大小*/public long fileSize;/*所属文件夹名称*/public String albumName;/*文件夹识别id*/public String albumId;/*缓存用于显示的路径*/private String showPicPath;
}
/*相册文件夹描述类*/
public class PhotoAlbumBean  implements Serializable{/*文件夹识别Id*/public String albumId;/*文件夹名称*/public String albumName;/*文件夹封面路径*/public String albumCoverPath;/*文件夹封面缩略图路径*/public String albumCoverThumbNailPath;/*文件夹包含的图片*/public ArrayList<LocalPhotoBean> imageList;/*缓存的用于显示的路径*/private String showPicPath;}/*查询返回结果集*/public static class LocalPhotoDataList{//所有图片列表public ArrayList<LocalPhotoBean> photoList;//相册文件夹列表public ArrayList<PhotoAlbumBean> albumList;public LocalPhotoDataList(ArrayList<LocalPhotoBean> photoList, ArrayList<PhotoAlbumBean> albumList) {this.photoList = photoList;this.albumList = albumList;}}/***  通过ContentResolver ，查询本地图片信息* @param resolver* @return*/public static LocalPhotoDataList getLocalPhotos(ContentResolver resolver, int minImageSize){ArrayList<LocalPhotoBean> photoList=new ArrayList<>();HashMap<String ,PhotoAlbumBean> albumMap=new HashMap<>();ArrayList<PhotoAlbumBean> albumList=new ArrayList<>();Cursor cursor=null;try {//需要查询的数据'String[] queryColumns={MediaStore.Images.ImageColumns.DISPLAY_NAME,//图片名MediaStore.Images.ImageColumns.DATA,//图片路径MediaStore.Images.ImageColumns._ID,//图片数据库MediaStore.Images.ImageColumns.BUCKET_ID,//图片所在文件夹IdMediaStore.Images.ImageColumns.BUCKET_DISPLAY_NAME,//图片所在文件夹文件名MediaStore.Images.ImageColumns.SIZE,//图片大小MediaStore.Images.ImageColumns.MIME_TYPE,//图片格式MediaStore.Images.ImageColumns.MINI_THUMB_MAGIC,//缩略图IdMediaStore.Images.ImageColumns.DATE_MODIFIED//修改时间};//查询的条件String selection=MediaStore.Images.ImageColumns.SIZE +" >= ? AND "+MediaStore.Images.ImageColumns.MIME_TYPE + " != ? ";//排序规则 修改时间降序排列String orderBy=MediaStore.Images.ImageColumns.DATE_MODIFIED+" DESC";String[] args=new String[]{String.valueOf(minImageSize),"image/gif"};//查询资源数据cursor=resolver.query(MediaStore.Images.Media.EXTERNAL_CONTENT_URI,queryColumns,selection,args,orderBy);if (cursor!=null&&cursor.moveToFirst()){int IndexName=cursor.getColumnIndex(MediaStore.Images.ImageColumns.DISPLAY_NAME);int IndexPath=cursor.getColumnIndex(MediaStore.Images.ImageColumns.DATA);int IndexId=cursor.getColumnIndex(MediaStore.Images.ImageColumns._ID);int IndexBucket=cursor.getColumnIndex(MediaStore.Images.ImageColumns.BUCKET_ID);int IndexBucketName=cursor.getColumnIndex(MediaStore.Images.ImageColumns.BUCKET_DISPLAY_NAME);int IndexSize=cursor.getColumnIndex(MediaStore.Images.ImageColumns.SIZE);int IndexThumbId=cursor.getColumnIndex(MediaStore.Images.ImageColumns.MINI_THUMB_MAGIC);do{LocalPhotoBean photoItem=new LocalPhotoBean().setMediaId(cursor.getLong(IndexId)).setFileName(cursor.getString(IndexName)).setPath(cursor.getString(IndexPath)).setAlbumName(cursor.getString(IndexBucketName)).setAlbumId(cursor.getString(IndexBucket)).setFileSize(cursor.getLong(IndexSize))/*暂时缩略图*/;photoList.add(photoItem);//刷新文件夹集合数据PhotoAlbumBean photoAlbum=albumMap.get(photoItem.albumId);if (photoAlbum==null){photoAlbum=PhotoAlbumBean.getInstance(photoItem.albumName,photoItem.albumId);albumMap.put(photoItem.albumId,photoAlbum);}photoAlbum.addItem(photoItem);}while (cursor.moveToNext());}/*相册文件夹列表*/albumList.addAll(albumMap.values());/*排序*/Collections.sort(albumList);return new LocalPhotoDataList(photoList, albumList);}catch (SecurityException se) {} catch (Exception e) {e.printStackTrace();LogUtils.d(ApiConstants.MEDIA_LOG_TAG, "Error getLocalPhotos");} finally {if (cursor != null) {cursor.close();}}return null;}