从mediastore的URI获取文件名和path
我有一个从mediastore图像select返回的onActivityResult ，我可以使用以下方法获取图像的URI：
Uri selectedImage = data.getData();
把它转换成一个string给出了这个：
content://media/externalhttp://img.dovov.commedia/47
或者到一个path给出：
/externalhttp://img.dovov.commedia/47
不过，我似乎无法find一种方法来将其转换为绝对path，因为我想将图像加载到位图而不必将其复制到某个位置。 我知道这可以使用URI和内容parsing器，但这似乎打破了重新启动手机，我猜MediaStore不会保持其重新编号之间的重新启动。
public String getRealPathFromURI(Context context, Uri contentUri) { Cursor cursor = null; try { String[] proj = { MediaStore.Images.Media.DATA }; cursor = context.getContentResolver().query(contentUri, proj, null, null, null); int column_index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA); cursor.moveToFirst(); return cursor.getString(column_index); } finally { if (cursor != null) { cursor.close(); } } }
第一个答案只是一个简单的更新： mActivity.managedQuery()现在已被弃用。 我用新的方法更新了代码。
private String getRealPathFromURI(Uri contentUri) { String[] proj = { MediaStore.Images.Media.DATA }; CursorLoader loader = new CursorLoader(mContext, contentUri, proj, null, null, null); Cursor cursor = loader.loadInBackground(); int column_index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA); cursor.moveToFirst(); String result = cursor.getString(column_index); cursor.close(); return result; }
Android开发源码
不要试图在文件系统中find一个uri，那么查看数据库的速度就会很慢。
你可以通过给工厂提供一个inputstream来获得一个位图，就像你给工厂发送一个文件一样：
InputStream is = getContentResolver().openInputStream(uri); Bitmap bitmap = BitmapFactory.decodeStream(is); is.close();
对于所有版本，我已经使这个方法从uri获得真正的path
@SuppressLint("NewApi") public static String getFilePath(Context context, Uri uri) throws URISyntaxException { String selection = null; String[] selectionArgs = null; // Uri is different in versions after KITKAT (Android 4.4), we need to if (Build.VERSION.SDK_INT >= 19 && DocumentsContract.isDocumentUri(context.getApplicationContext(), uri)) { if (isExternalStorageDocument(uri)) { final String docId = DocumentsContract.getDocumentId(uri); final String[] split = docId.split(":"); return Environment.getExternalStorageDirectory() + "/" + split[1]; } else if (isDownloadsDocument(uri)) { final String id = DocumentsContract.getDocumentId(uri); uri = ContentUris.withAppendedId( Uri.parse("content://downloads/public_downloads"), Long.valueOf(id)); } else if (isMediaDocument(uri)) { final String docId = DocumentsContract.getDocumentId(uri); final String[] split = docId.split(":"); final String type = split[0]; if ("image".equals(type)) { uri = MediaStore.Images.Media.EXTERNAL_CONTENT_URI; } else if ("video".equals(type)) { uri = MediaStore.Video.Media.EXTERNAL_CONTENT_URI; } else if ("audio".equals(type)) { uri = MediaStore.Audio.Media.EXTERNAL_CONTENT_URI; } selection = "_id=?"; selectionArgs = new String[]{ split[1] }; } } if ("content".equalsIgnoreCase(uri.getScheme())) { String[] projection = { MediaStore.Images.Media.DATA }; Cursor cursor = null; try { cursor = context.getContentResolver() .query(uri, projection, selection, selectionArgs, null); int column_index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA); if (cursor.moveToFirst()) { return cursor.getString(column_index); } } catch (Exception e) { } } else if ("file".equalsIgnoreCase(uri.getScheme())) { return uri.getPath(); } return null; } public static boolean isExternalStorageDocument(Uri uri) { return "com.android.externalstorage.documents".equals(uri.getAuthority()); } public static boolean isDownloadsDocument(Uri uri) { return "com.android.providers.downloads.documents".equals(uri.getAuthority()); } public static boolean isMediaDocument(Uri uri) { return "com.android.providers.media.documents".equals(uri.getAuthority()); }
这里是我的例子，从URI像file：// …和content：// …获取文件名。 它不仅适用于Android MediaStore，也适用于EzExplorer等第三方应用程序。
public static String getFileNameByUri(Context context, Uri uri) { String fileName="unknown";//default fileName Uri filePathUri = uri; if (uri.getScheme().toString().compareTo("content")==0) { Cursor cursor = context.getContentResolver().query(uri, null, null, null, null); if (cursor.moveToFirst()) { int column_index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);//Instead of "MediaStore.Images.Media.DATA" can be used "_data" filePathUri = Uri.parse(cursor.getString(column_index)); fileName = filePathUri.getLastPathSegment().toString(); } } else if (uri.getScheme().compareTo("file")==0) { fileName = filePathUri.getLastPathSegment().toString(); } else { fileName = fileName+"_"+filePathUri.getLastPathSegment(); } return fileName; }
好现有的答案，其中一些我曾经拿出我自己的：
我必须从URI获取path并从path中获取URI，Google很难分辨出具有相同问题的任何人（例如，从MediaStore获取已经物理位置的video的缩略图有）。 前者：
/** * Gets the corresponding path to a file from the given content:// URI * @param selectedVideoUri The content:// URI to find the file path from * @param contentResolver The content resolver to use to perform the query. * @return the file path as a string */ private String getFilePathFromContentUri(Uri selectedVideoUri, ContentResolver contentResolver) { String filePath; String[] filePathColumn = {MediaColumns.DATA}; Cursor cursor = contentResolver.query(selectedVideoUri, filePathColumn, null, null, null); cursor.moveToFirst(); int columnIndex = cursor.getColumnIndex(filePathColumn[0]); filePath = cursor.getString(columnIndex); cursor.close(); return filePath; }
后者（我为video做的，但也可以通过MediaStore.Audio（等）代替MediaStore.Video用于audio或文件或其他types的存储内容）：
/** * Gets the MediaStore video ID of a given file on external storage * @param filePath The path (on external storage) of the file to resolve the ID of * @param contentResolver The content resolver to use to perform the query. * @return the video ID as a long */ private long getVideoIdFromFilePath(String filePath, ContentResolver contentResolver) { long videoId; Log.d(TAG,"Loading file " + filePath); // This returns us content://media/external/videos/media (or something like that) // I pass in "external" because that's the MediaStore's name for the external // storage on my device (the other possibility is "internal") Uri videosUri = MediaStore.Video.Media.getContentUri("external"); Log.d(TAG,"videosUri = " + videosUri.toString()); String[] projection = {MediaStore.Video.VideoColumns._ID}; // TODO This will break if we have no matching item in the MediaStore. Cursor cursor = contentResolver.query(videosUri, projection, MediaStore.Video.VideoColumns.DATA + " LIKE ?", new String[] { filePath }, null); cursor.moveToFirst(); int columnIndex = cursor.getColumnIndex(projection[0]); videoId = cursor.getLong(columnIndex); Log.d(TAG,"Video ID is " + videoId); cursor.close(); return videoId; }
基本上， MediaStore的DATA列（或者你要查询的任何子节）存储文件path，所以你要么使用你知道的来查找那个DATA域，要么使用这个域来查找你想要的任何东西。
然后，我进一步使用上面的Scheme来弄清楚如何处理我的数据：
private boolean getSelectedVideo(Intent imageReturnedIntent, boolean fromData) { Uri selectedVideoUri; //Selected image returned from another activity // A parameter I pass myself to know whether or not I'm being "shared via" or // whether I'm working internally to my app (fromData = working internally) if(fromData){ selectedVideoUri = imageReturnedIntent.getData(); } else { //Selected image returned from SEND intent // which I register to receive in my manifest // (so people can "share via" my app) selectedVideoUri = (Uri)getIntent().getExtras().get(Intent.EXTRA_STREAM); } Log.d(TAG,"SelectedVideoUri = " + selectedVideoUri); String filePath; String scheme = selectedVideoUri.getScheme(); ContentResolver contentResolver = getContentResolver(); long videoId; // If we are sent file://something or content://org.openintents.filemanager/mimetype/something... if(scheme.equals("file") || (scheme.equals("content") && selectedVideoUri.getEncodedAuthority().equals("org.openintents.filemanager"))){ // Get the path filePath = selectedVideoUri.getPath(); // Trim the path if necessary // openintents filemanager returns content://org.openintents.filemanager/mimetype//mnt/sdcard/xxxx.mp4 if(filePath.startsWith("/mimetype/")){ String trimmedFilePath = filePath.substring("/mimetype/".length()); filePath = trimmedFilePath.substring(trimmedFilePath.indexOf("/")); } // Get the video ID from the path videoId = getVideoIdFromFilePath(filePath, contentResolver); } else if(scheme.equals("content")){ // If we are given another content:// URI, look it up in the media provider videoId = Long.valueOf(selectedVideoUri.getLastPathSegment()); filePath = getFilePathFromContentUri(selectedVideoUri, contentResolver); } else { Log.d(TAG,"Failed to load URI " + selectedVideoUri.toString()); return false; } return true; }
这些答案在所有情况下都不适用于我。 我不得不直接去Google的文档https://developer.android.com/guide/topics/providers/document-provider.html这个主题，发现这个有用的方法：;
private Bitmap getBitmapFromUri(Uri uri) throws IOException { ParcelFileDescriptor parcelFileDescriptor = getContentResolver().openFileDescriptor(uri, "r"); FileDescriptor fileDescriptor = parcelFileDescriptor.getFileDescriptor(); Bitmap image = BitmapFactory.decodeFileDescriptor(fileDescriptor); parcelFileDescriptor.close(); return image; }
您可以使用此位图在图像视图中显示它。
解决那些在转移到KitKat后有问题的人：
“这将从MediaProvider，DownloadsProvider和ExternalStorageProvider获取文件path，同时回退到非官方的ContentProvider方法” https://stackoverflow.com/a/20559175/690777
由于managedQuery已被弃用，您可以尝试：
CursorLoader cursorLoader = new CursorLoader(context, uri, proj, null, null, null); Cursor cursor = cursorLoader.loadInBackground();
在这里你得到的文件的名称
String[] projection = {MediaStore.MediaColumns.DISPLAY_NAME}; Uri uri = data.getData(); String fileName = null; ContentResolver cr = getActivity().getApplicationContext().getContentResolver(); Cursor metaCursor = cr.query(uri, projection, null, null, null); if (metaCursor != null) { try { if (metaCursor.moveToFirst()) { fileName = metaCursor.getString(0); } } finally { metaCursor.close(); } }
在这里，我将向您展示如何创build一个BROWSEbutton，当您点击它时，它将打开SD卡，您将select一个文件，结果您将获得所选的文件名和文件path一：
一个你会打的button
browse.setOnClickListener(new OnClickListener() { public void onClick(View v) { Intent intent = new Intent(); intent.setAction(Intent.ACTION_PICK); Uri startDir = Uri.fromFile(new File("/sdcard")); startActivityForResult(intent, PICK_REQUEST_CODE); } });
这将获得结果文件名和文件path的function
protected void onActivityResult(int requestCode, int resultCode, Intent intent) { if (requestCode == PICK_REQUEST_CODE) { if (resultCode == RESULT_OK) { Uri uri = intent.getData(); if (uri.getScheme().toString().compareTo("content")==0) { Cursor cursor =getContentResolver().query(uri, null, null, null, null); if (cursor.moveToFirst()) { int column_index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);//Instead of "MediaStore.Images.Media.DATA" can be used "_data" Uri filePathUri = Uri.parse(cursor.getString(column_index)); String file_name = filePathUri.getLastPathSegment().toString(); String file_path=filePathUri.getPath(); Toast.makeText(this,"File Name & PATH are:"+file_name+"\n"+file_path, Toast.LENGTH_LONG).show(); } } } } }
从图库中获取图像后，只在Android 4.4 （KitKat）中通过以下方法中的URI：
public String getPath(Uri contentUri) {// Will return "image:x*" String wholeID = DocumentsContract.getDocumentId(contentUri); // Split at colon, use second item in the array String id = wholeID.split(":")[1]; String[] column = { MediaStore.Images.Media.DATA }; // Where id is equal to String sel = MediaStore.Images.Media._ID + "=?"; Cursor cursor = getContentResolver().query( MediaStore.Images.Media.EXTERNAL_CONTENT_URI, column, sel, new String[] { id }, null); String filePath = ""; int columnIndex = cursor.getColumnIndex(column[0]); if (cursor.moveToFirst()) { filePath = cursor.getString(columnIndex); } cursor.close(); return filePath; }
此解决scheme适用于每种情况：
在某些情况下，从URL获取path太困难了。 那你为什么需要这条路？ 在其他地方复制文件？ 你不需要path。
public void SavePhotoUri (Uri imageuri, String Filename){ File FilePath = context.getDir(Environment.DIRECTORY_PICTURES,Context.MODE_PRIVATE); try { Bitmap selectedImage = MediaStore.Images.Media.getBitmap(context.getContentResolver(), imageuri); String destinationImagePath = FilePath + "/" + Filename; FileOutputStream destination = new FileOutputStream(destinationImagePath); selectedImage.compress(Bitmap.CompressFormat.JPEG, 100, destination); destination.close(); } catch (Exception e) { Log.e("error", e.toString()); } }
@PercyPercy的稍微修改的版本 – 它不会抛出，只是在出现任何错误时返回null ：
public String getPathFromMediaUri(Context context, Uri uri) { String result = null; String[] projection = { MediaStore.Images.Media.DATA }; Cursor cursor = context.getContentResolver().query(uri, projection, null, null, null); int col = cursor.getColumnIndex(MediaStore.Images.Media.DATA); if (col >= 0 && cursor.moveToFirst()) result = cursor.getString(col); cursor.close(); return result; }
简单和容易。 你可以像下面这样从URI做到这一点！
public void getContents(Uri uri) { Cursor vidCursor = getActivity.getContentResolver().query(uri, null, null, null, null); if (vidCursor.moveToFirst()) { int column_index = vidCursor .getColumnIndexOrThrow(MediaStore.Images.Media.DATA); Uri filePathUri = Uri.parse(vidCursor .getString(column_index)); String video_name = filePathUri.getLastPathSegment().toString(); String file_path=filePathUri.getPath(); Log.i("TAG", video_name + "\b" file_path); } }
试试这个来自Uri的图像文件path
public void getImageFilePath(Context context, Uri uri) { Cursor cursor = context.getContentResolver().query(uri, null, null, null, null); cursor.moveToFirst(); String image_id = cursor.getString(0); image_id = image_id.substring(image_id.lastIndexOf(":") + 1); cursor.close(); cursor = context.getContentResolver().query(android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI, null, MediaStore.Images.Media._ID + " = ? ", new String[]{image_id}, null); cursor.moveToFirst(); String path = cursor.getString(cursor.getColumnIndex(MediaStore.Images.Media.DATA)); cursor.close(); upLoadImageOrLogo(path); }
Bitmap bitmap = MediaStore.Images.Media.getBitmap(getContentResolver(), uri);
