android图片文件的路径地址与Uri的相互转换

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;            }        }    }}

摘自：http://www.jcodecraeer.com/a/anzhuokaifa/androidkaifa/2014/0821/1660.html

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