Android获取图片的路径方法总结

android系统通过图片绝对路径获取URI的两种方法。

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1.将所有的图片路径取出，遍历比较找到需要的路径，取出URI，效率较低

其中 MediaStore.MediaColumns.DATA 字段存的就是图片的绝对路径，

最后mImageUri得到的就是图片的URI

Uri mUri = Uri.parse("content://media/external/images/media");
 Uri mImageUri = null;
 Cursor cursor = managedQuery(
                                 MediaStore.Images.Media.EXTERNAL_CONTENT_URI, null, null, null,
                                MediaStore.Images.Media.DEFAULT_SORT_ORDER);
 cursor.moveToFirst();

 while (!cursor.isAfterLast()) {
                         String data = cursor.getString(cursor
                                         .getColumnIndex(MediaStore.MediaColumns.DATA));
                         if (picPath.equals(data)) {
                                 int ringtoneID = cursor.getInt(cursor
                                                 .getColumnIndex(MediaStore.MediaColumns._ID));
                                 mImageUri = Uri.withAppendedPath(mUri, "" + ringtoneID);
                                 break;
                         }
                         cursor.moveToNext();
 }

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2.直接从媒体数据库根据字段取出相应的记录，效率较高

                 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;
                             }
                         }
                     }
                 }