Android将"content://"类型的uri转为文件路径

uri有多种类型的的scheme，例如content、file等，有些时候我们需要文件存储的真实路径例如Android混合开发中使用

public class ContentUriUtil {
	/**
	 * Get a file path from a Uri. This will get the the path for Storage Access
	 * Framework Documents, as well as the _data field for the MediaStore and
	 * other file-based ContentProviders.
	 *
	 * @param context The context.
	 * @param uri The Uri to query.
	 * @author paulburke
	 */
	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 the remote address
	        if (isGooglePhotosUri(uri))
	            return uri.getLastPathSegment();

	        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 index = cursor.getColumnIndexOrThrow(column);
	            return cursor.getString(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());
	}

	/**
	 * @param uri The Uri to check.
	 * @return Whether the Uri authority is Google Photos.
	 */
	public static boolean isGooglePhotosUri(Uri uri) {
	    return "com.google.android.apps.photos.content".equals(uri.getAuthority());
	}
}

代码中的注释比较详细，在此不多做解释，如有什么疑问可以留言。

在使用上面给出的工具类获取到路径后，还需要在做一步处理使其转为“file:///”类型的uri

Uri.fromFile(new File(ContentUriUtil.getPath(mActivity, resultDataUri)));

参考资源：http://stackoverflow.com/questions/19985286/convert-content-uri-to-actual-path-in-android-4-4