先看下4.4之前的uri的形式:Uri : content://media/extenral/images/media/17766
是不是很熟悉?再看4.4及以后的Uri形式:
content://com.android.providers.media.documents/document/image%2706
日志一打印出来我就明白是什么原因啦。这什么东西在Android 4.4前后不一样,4.4之前content后面是文件全路径,4.4之后不再直接表示路径啦。这就好办啦,翻了翻API后发现4.4以后的Uri还不唯一,并不是统一的一种格式,所以就来个通用解决办法好啦:
插播一条
以下是4.2.2之后,4.4以前managedQuery方法被废弃后的解决方案:
public String getRealPathFromURI(Uri contentUri) { String res = null; String[] proj = { MediaStore.Images.Media.DATA }; Cursor cursor = getContentResolver().query(contentUri, proj, null, null, null); if(cursor.moveToFirst()){; int column_index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA); res = cursor.getString(column_index); } cursor.close(); return res; }
4.4以前通过Uri获取路径:data是Uri,filename是一个String的字符串,用来保存路径。
public static String getPathByUri(Context context, Uri data) { String filename=null; if (data.getScheme().toString().compareTo("content") == 0) { Cursor cursor = context.getContentResolver().query(data, new String[] { "_data" }, null, null, null); if (cursor.moveToFirst()) { filename = cursor.getString(0); } } else if (data.getScheme().toString().compareTo("file") == 0) {// file:///开头的uri filename = data.toString(); filename = data.toString().replace("file://", "");// 替换file:// if (!filename.startsWith("/mnt")) {// 加上"/mnt"头 filename += "/mnt"; } } return filename; }
4.4以后根据Uri获取路径:
// 专为Android4.4设计的从Uri获取文件绝对路径,以前的方法已不好使 @SuppressLint("NewApi") public static String getPathByUri4kitkat(final Context context, final Uri uri) { final boolean isKitKat = Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT; // DocumentProvider if (isKitKat && 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)) { return Environment.getExternalStorageDirectory() + "/" + split[1]; } } 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)); return getDataColumn(context, contentUri, null, null); } 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] }; return getDataColumn(context, contentUri, selection, selectionArgs); } } else if ("content".equalsIgnoreCase(uri.getScheme())) {// MediaStore // (and // general) return getDataColumn(context, uri, null, null); } else if ("file".equalsIgnoreCase(uri.getScheme())) {// File return uri.getPath(); } return null; } /** * Get the value of the data column for this Uri. This is useful for * MediaStore Uris, and other file-based ContentProviders. * * @param context * The context. * @param uri * The Uri to query. * @param selection * (Optional) Filter used in the query. * @param selectionArgs * (Optional) Selection arguments used in the query. * @return The value of the _data column, which is typically a file path. */ public 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; } /** * @param uri * The Uri to check. * @return Whether the Uri authority is ExternalStorageProvider. */ public static boolean isExternalStorageDocument(Uri uri) { return "com.android.externalstorage.documents".equals(uri.getAuthority()); } /** * @param uri * The Uri to check. * @return Whether the Uri authority is DownloadsProvider. */ public static boolean isDownloadsDocument(Uri uri) { return "com.android.providers.downloads.documents".equals(uri.getAuthority()); } /** * @param uri * The Uri to check. * @return Whether the Uri authority is MediaProvider. */ public static boolean isMediaDocument(Uri uri) { return "com.android.providers.media.documents".equals(uri.getAuthority()); }
安卓2.3.3 & 4.0.4 & 4.4 & 5.1.1 & 6.0真机亲测都正常,欢迎拷贝!
最后,附上一个Video项目用到的相关函数供参考:
//return the id of URI public static int getVideoUriByPath(Uri resultUri, Activity activity, String path){ resultUri= null; int id=-1; if(activity==null || path==null) return id; Uri preUri = Uri.parse("content://media/external/video/media/"); @SuppressWarnings("deprecation") Cursor cursor = activity.managedQuery(MediaStore.Video.Media.EXTERNAL_CONTENT_URI, null, null, null, MediaStore.Video.Media.DEFAULT_SORT_ORDER); cursor.moveToFirst(); while (!cursor.isAfterLast()) { String data = cursor.getString(cursor.getColumnIndexOrThrow(MediaStore.Video.Media.DATA)); if (path.equals(data)) { id = cursor.getInt(cursor.getColumnIndexOrThrow(MediaStore.Video.Media._ID)); resultUri = Uri.withAppendedPath(preUri, "" + id); break; } cursor.moveToNext(); } return id; }