Android中Uri和Path之间的转换
Android Uri,Path与File的相互转换(新) 一、path->file File file = new File(path); 二、 file->path String path = file.getPath(); 注意URI和Uri的区别 1 URI:是java.net的子类 2 Uri :是android.net的子类,Uri 不能被实例化 三、 URI->File File file = null; //图片地址 try { file = new File(new URI(uri.toString())); } catch (URISyntaxException e) { e.printStackTrace(); } 四、 File->URI URI uri = file.toURI(); 五、 Path->Uri Uri uri = Uri.parse(path); 六、Uri->Path 网上很多通过context.getContentResolver().query方式可能会遇到空指针的问题 这里通过使用:https://juejin.im/entry/5a508655f265da3e2d3340d5 提供的封装方法 去处理Uri转Path的问题 传入 context 和 Uri即可 public class UriTofilePath { public static String getFilePathByUri(Context context, Uri uri) { String path = null; // 4.4及之后的 是以 content:// 开头的,比如 content://com.android.providers.media.documents/document/image%3A235700 if (ContentResolver.SCHEME_CONTENT.equals(uri.getScheme()) && Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) { if (DocumentsContract.isDocumentUri(context, uri)) { if (isExternalStorageDocument(uri)) { // ExternalStorageProvider final String docId = DocumentsContract.getDocumentId(uri); final String[] split = docId.split(":"); final String type = split[0]; if ("primary".equalsIgnoreCase(type)) { path = Environment.getExternalStorageDirectory() + "/" + split[1]; return path; } } else if (isDownloadsDocument(uri)) { // DownloadsProvider final String id = DocumentsContract.getDocumentId(uri); final Uri contentUri = ContentUris.withAppendedId(Uri.parse("content://downloads/public_downloads"), Long.valueOf(id)); path = getDataColumn(context, contentUri, null, null); return path; } else if (isMediaDocument(uri)) { // MediaProvider final String docId = DocumentsContract.getDocumentId(uri); final String[] split = docId.split(":"); final String type = split[0]; Uri contentUri = null; if ("image".equals(type)) { contentUri = MediaStore.Images.Media.EXTERNAL_CONTENT_URI; } else if ("video".equals(type)) { contentUri = MediaStore.Video.Media.EXTERNAL_CONTENT_URI; } else if ("audio".equals(type)) { contentUri = MediaStore.Audio.Media.EXTERNAL_CONTENT_URI; } final String selection = "_id=?"; final String[] selectionArgs = new String[]{split[1]}; path = getDataColumn(context, contentUri, selection, selectionArgs); return path; } } }else { // 以 file:// 开头的 if (ContentResolver.SCHEME_FILE.equals(uri.getScheme())) { path = uri.getPath(); return path; } // 以 content:// 开头的,比如 content://media/extenral/images/media/17766 if (ContentResolver.SCHEME_CONTENT.equals(uri.getScheme()) && Build.VERSION.SDK_INT < Build.VERSION_CODES.KITKAT) { Cursor cursor = context.getContentResolver().query(uri, new String[]{MediaStore.Images.Media.DATA}, null, null, null); if (cursor != null) { if (cursor.moveToFirst()) { int columnIndex = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA); if (columnIndex > -1) { path = cursor.getString(columnIndex); } } cursor.close(); } return path; } } return null; } private static String getDataColumn(Context context, Uri uri, String selection, String[] selectionArgs) { Cursor cursor = null; final String column = "_data"; final String[] projection = {column}; try { cursor = context.getContentResolver().query(uri, projection, selection, selectionArgs, null); if (cursor != null && cursor.moveToFirst()) { final int column_index = cursor.getColumnIndexOrThrow(column); return cursor.getString(column_index); } } finally { if (cursor != null) cursor.close(); } return null; } private static boolean isExternalStorageDocument(Uri uri) { return "com.android.externalstorage.documents".equals(uri.getAuthority()); } private static boolean isDownloadsDocument(Uri uri) { return "com.android.providers.downloads.documents".equals(uri.getAuthority()); } private static boolean isMediaDocument(Uri uri) { return "com.android.providers.media.documents".equals(uri.getAuthority()); } } **七、 Uri->file ** 可以先Uri->path 再path->file 八、file->Uri 可以先 file->path 再path->Uri 九、 删除Uri MainActivity.this.getContentResolver().delete(imageUri, null, null); 图片的Uri转Bitmap Bitmap bitmap = BitmapFactory.decodeStream(contentResolver.openInputStream(xxxUri)) bitmap转为jpg文件 BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream(file)); bitmap.compress(Bitmap.CompressFormat.JPEG, 100, bos); 资源文件转Bitmap BitmapFactory.decodeResource(getResources(),R.drawable.ic ); jpg或者png文件转Bitmap String fileName = "/data/com.test/aa.png; Bitmap bm = BitmapFactory.decodeFile(fileName); ———————————————— 版权声明:本文为CSDN博主「5ingwings」的原创文章,遵循 CC 4.0 BY-SA 版权协议,转载请附上原文出处链接及本声明。 原文链接:https://blog.csdn.net/weixin_37577039/article/details/79242455