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今天我在做视频编辑的时候,遇到了这个问题,前后用了1个小时来发现并解决了这个问题,因为我一直认为是我记错了,后来发现,华为P6用的是Android4.4系统,然后我就恍然了。。。
首先说说我在做什么,我在弄一个拍摄完视频之后,编辑视频的一个东东,这个东东其实不难,源码里有,你们是不是不敢信?!在android源码android.media.videoeditor中有videoeditor这个类,这个其实就是谷歌写的编辑视频的东东,他底层调用了几个C++写的lib库,这些库谷歌也都写好了,我们调用下他即可,然后我在编辑视频的时候,要添加铃声,根据我写的uri获取路径的时候,一直返回null,好奇怪,最后发现华为P6用了4.4系统。。。下面不罗嗦了,直接上代码。
这里先看下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我打印出来当时就爆粗口了,这什么东西?!在看P6的系统,果然,4.4的。
这就好说了,然后翻了翻API,发现4.4以后的Uri还不唯一,并不是统一的一种格式,所以就来个通用方法好了
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。
if (data.getScheme().toString().compareTo("content") == 0) { cursor = getContentResolver().query(data, new String[] {Audio.Media.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"; } }
public class GetPathFromUri4kitkat { /** * 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 getPath(final Context context, final Uri uri) { final boolean isKitKat = Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT; // DocumentProvider if (isKitKat && DocumentsContract.isDocumentUri(context, uri)) { // ExternalStorageProvider if (isExternalStorageDocument(uri)) { 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]; } // TODO handle non-primary volumes } // DownloadsProvider else if (isDownloadsDocument(uri)) { 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); } // MediaProvider else if (isMediaDocument(uri)) { 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); } } // MediaStore (and general) else if ("content".equalsIgnoreCase(uri.getScheme())) { return getDataColumn(context, uri, null, null); } // File else if ("file".equalsIgnoreCase(uri.getScheme())) { 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()); } }这部分代码借鉴了网上的一些例子,亲测可用,欢迎copy。
Android 4.4 kitkat以上及以下根据uri获取路径的方法
原文地址:http://blog.csdn.net/u011200844/article/details/43703593