URI通过ContentResolver转换file

//10以下：
/**
     * Try to return the absolute file path from the given Uri
     *
     * @param context
     * @param uri
     * @return the file path or null
     */
    public static String getRealFilePath( final Context context, final Uri uri ) {
        if ( null == uri ) return null;
        final String scheme = uri.getScheme();
        String data = null;
        if ( scheme == null )
            data = uri.getPath();
        else if ( ContentResolver.SCHEME_FILE.equals( scheme ) ) {
            data = uri.getPath();
        } else if ( ContentResolver.SCHEME_CONTENT.equals( scheme ) ) {
            Cursor cursor = context.getContentResolver().query( uri, new String[] { MediaStore.Images.ImageColumns.DATA }, null, null, null );
            if ( null != cursor ) {
                if ( cursor.moveToFirst() ) {
                    int index = cursor.getColumnIndex( MediaStore.Images.ImageColumns.DATA );
                    if ( index > -1 ) {
                        data = cursor.getString( index );
                    }
                }
                cursor.close();
            }
        }
        return data;
    }
//10以上
    @RequiresApi(Build.VERSION_CODES.Q)
    public File uriToFileApiQ(Context context,Uri uri ) throws IOException,NoSuchMethodError {
        File file = null;
        if(uri == null) return file;
        //android10以上转换
        if (uri.getScheme().equals(ContentResolver.SCHEME_FILE)) {
            file = new File(uri.getPath());
        } else if (uri.getScheme().equals(ContentResolver.SCHEME_CONTENT)) {
            //把文件复制到沙盒目录
            ContentResolver contentResolver = context.getContentResolver();
            String displayName = "uritofile"
                    +"."+ MimeTypeMap.getSingleton().getExtensionFromMimeType(contentResolver.getType(uri));

//            注释掉的方法可以获取到原文件的文件名，但是比较耗时
//            Cursor cursor = contentResolver.query(uri, null, null, null, null);
//            if (cursor.moveToFirst()) {
//                String displayName = cursor.getString(cursor.getColumnIndex(OpenableColumns.DISPLAY_NAME));}

                InputStream is = contentResolver.openInputStream(uri);
                File cache = new File(context.getCacheDir().getAbsolutePath(), displayName);
                FileOutputStream fos = new FileOutputStream(cache);
                FileUtils.copy(is, fos);
                file = cache;
                fos.close();
                is.close();

        }
        return file;
    }

file转URI

                String type = Utils.ensureNotNull(intent.getType());
                Log.d(TAG, "uri is " + uri);
                if (uri.getScheme().equals("file") && (type.contains("image/"))) {
                    String path = uri.getEncodedPath();
                    Log.d(TAG, "path1 is " + path);
                    if (path != null) {
                        path = Uri.decode(path);
                        Log.d(TAG, "path2 is " + path);
                        ContentResolver cr = this.getContentResolver();
                        StringBuffer buff = new StringBuffer();
                        buff.append("(")
                                .append(Images.ImageColumns.DATA)
                                .append("=")
                                .append("'" + path + "'")
                                .append(")");
                        Cursor cur = cr.query(
                                Images.Media.EXTERNAL_CONTENT_URI,
                                new String[] { Images.ImageColumns._ID },
                                buff.toString(), null, null);
                        int index = 0;
                        for (cur.moveToFirst(); !cur.isAfterLast(); cur
                                .moveToNext()) {
                            index = cur.getColumnIndex(Images.ImageColumns._ID);
                            // set _id value
                            index = cur.getInt(index);
                        }
                        if (index == 0) {
                            //do nothing
                        } else {
                            Uri uri_temp = Uri
                                    .parse("content://media/external/images/media/"
                                            + index);
                            Log.d(TAG, "uri_temp is " + uri_temp);
                            if (uri_temp != null) {
                                uri = uri_temp;
                            }
                        }
                    }
                }