How to implement a content provider with more than one table?

Question

update: looking at \"vnd.android.cursor.dir/vnd.google.note\" and \"vnd.android.cursor.item/vnd.google.note\" it seemed to me as thoug

Answer 1

Here is my code for multiple table query in content provider with projectionMap

//HashMap for Projection
 mGroupImageUri = new HashMap<>();
    mGroupImageUri.put(RosterConstants.JID,RosterProvider.TABLE_ROSTER+"."+RosterConstants.JID);
    mGroupImageUri.put(RosterConstants.USER_NAME,RosterProvider.TABLE_ROSTER+"."+RosterConstants.USER_NAME);
    mGroupImageUri.put(ChatConstants.MESSAGE,"c."+ChatConstants.MESSAGE+ " AS "+ ChatConstants.MESSAGE);
    mGroupImageUri.put(ChatConstants.SENDER,"c."+ChatConstants.SENDER+" AS "+ChatConstants.SENDER);
    mGroupImageUri.put(ChatConstants.URL_LOCAL,"c."+ChatConstants.URL_LOCAL+" AS "+ChatConstants.URL_LOCAL);

//case for content type of uri
  case IMAGE_URI:
            qBuilder.setTables(RosterProvider.TABLE_ROSTER
                    + " LEFT OUTER JOIN "+ TABLE_NAME + " c"
                    + " ON c."+ ChatConstants.JID + "=" + RosterProvider.TABLE_ROSTER + "."+RosterConstants.JID);
            qBuilder.setProjectionMap(mGroupImageUri);
            break;

    //ContentResolver query for Projection form, selection and selection args
String[] PROJECTION_FROM = new String[]{
            RosterConstants.JID,
            RosterConstants.USER_NAME,
            ChatConstants.MESSAGE,
            ChatConstants.SENDER,
            ChatConstants.URL_LOCAL
    };

    String selection = RosterProvider.TABLE_ROSTER +"."+RosterConstants.JID+ "='" + jid + "' AND " + "c."+ChatConstants.FILE_TYPE+"="+ChatConstants.IMAGE;
    String[] selectionArgu = null;
    String order = "c."+ChatConstants.MESSAGE+" ASC";

    Cursor cursor = mContentReolver.query(ChatProvider.CONTENT_URI_GROUP_IMAGE_URI,
            PROJECTION_FROM,selection, null,order);

    //@ChatProvider.CONTENT_URI_GROUP_IMAGE_URI = 'your content type uri'
    //@TABLE_NAME = 'table1'
    //@RosterProvider.TABLE_ROSTER ='table2'