android圖片檔案的路徑地址與Uri的相互轉換

標籤：ringbuf   檔案   column   android   nbsp   val   get   ==   media   

一個android檔案的Uri地址一般如下：

content://media/external/images/media/62026

這是一張圖片的Uri，那麼我們如何根據這個Uri獲得其在檔案系統中的路徑呢？

其實很簡單，直接上代碼：

/** * 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;}

那麼假如我們有一個圖片的路徑地址又該如何獲得其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;                            }                        }                    }                }                   

 

android圖片檔案的路徑地址與Uri的相互轉換