标签:ringbuf 文件 column android nbsp val get == media
一个android文件的Uri地址一般如下:
content://media/external/images/media/62026
这是一张图片的Uri,那么我们如何根据这个Uri获得其在文件系统中的路径呢?
其实很简单,直接上代码:
/** * Try to return the absolute file path from the given Uri * * @param context * @param uri * @return the file path or null */ public static String getRealFilePath( final Context context, final Uri uri ) { if ( null == uri ) return null; final String scheme = uri.getScheme(); String data = null; if ( scheme == null ) data = uri.getPath(); else if ( ContentResolver.SCHEME_FILE.equals( scheme ) ) { data = uri.getPath(); } else if ( ContentResolver.SCHEME_CONTENT.equals( scheme ) ) { Cursor cursor = context.getContentResolver().query( uri, new String[] { ImageColumns.DATA }, null, null, null ); if ( null != cursor ) { if ( cursor.moveToFirst() ) { int index = cursor.getColumnIndex( ImageColumns.DATA ); if ( index > -1 ) { data = cursor.getString( index ); } } cursor.close(); } } return data; }
那么假如我们有一个图片的路径地址又该如何获得其Uri呢?
String type = Utils.ensureNotNull(intent.getType()); Log.d(TAG, "uri is " + uri); if (uri.getScheme().equals("file") && (type.contains("image/"))) { String path = uri.getEncodedPath(); Log.d(TAG, "path1 is " + path); if (path != null) { path = Uri.decode(path); Log.d(TAG, "path2 is " + path); ContentResolver cr = this.getContentResolver(); StringBuffer buff = new StringBuffer(); buff.append("(") .append(Images.ImageColumns.DATA) .append("=") .append("‘" + path + "‘") .append(")"); Cursor cur = cr.query( Images.Media.EXTERNAL_CONTENT_URI, new String[] { Images.ImageColumns._ID }, buff.toString(), null, null); int index = 0; for (cur.moveToFirst(); !cur.isAfterLast(); cur .moveToNext()) { index = cur.getColumnIndex(Images.ImageColumns._ID); // set _id value index = cur.getInt(index); } if (index == 0) { //do nothing } else { Uri uri_temp = Uri .parse("content://media/external/images/media/" + index); Log.d(TAG, "uri_temp is " + uri_temp); if (uri_temp != null) { uri = uri_temp; } } } }
标签:ringbuf 文件 column android nbsp val get == media
原文地址:http://www.cnblogs.com/zhujiabin/p/6692833.html