/**
 * Returns the current list of channels your app provides.
 *
 * @param resolver Application's ContentResolver.
 * @return List of channels.
 */
public static List<Channel> getChannels(ContentResolver resolver) {
    List<Channel> channels = new ArrayList<>();
    // TvProvider returns programs in chronological order by default.
    Cursor cursor = null;
    try {
        cursor = resolver.query(Channels.CONTENT_URI, Channel.PROJECTION, null, null, null);
        if (cursor == null || cursor.getCount() == 0) {
            return channels;
        }
        while (cursor.moveToNext()) {
            channels.add(Channel.fromCursor(cursor));
        }
    } catch (Exception e) {
        Log.w(TAG, "Unable to get channels", e);
    } finally {
        if (cursor != null) {
            cursor.close();
        }
    }
    return channels;
}
 

/**
 * Returns the current list of channels your app provides.
 *
 * @param resolver Application's ContentResolver.
 * @return List of channels.
 */
public static List<Channel> getChannels(ContentResolver resolver) {
    List<Channel> channels = new ArrayList<>();
    // TvProvider returns programs in chronological order by default.
    Cursor cursor = null;
    try {
        cursor = resolver.query(Channels.CONTENT_URI, Channel.PROJECTION, null, null, null);
        if (cursor == null || cursor.getCount() == 0) {
            return channels;
        }
        while (cursor.moveToNext()) {
            channels.add(Channel.fromCursor(cursor));
        }
    } catch (Exception e) {
        Log.w(TAG, "Unable to get channels", e);
    } finally {
        if (cursor != null) {
            cursor.close();
        }
    }
    return channels;
}
 

public static LongSparseArray<Channel> buildChannelMap(ContentResolver resolver,
                                                                     String inputId, List<Channel> channels) {
    Uri uri = TvContract.buildChannelsUriForInput(inputId);
    String[] projection = {
            TvContract.Channels._ID,
            TvContract.Channels.COLUMN_DISPLAY_NUMBER
    };

    LongSparseArray<Channel> channelMap = new LongSparseArray<>();
    Cursor cursor = null;
    try {
        cursor = resolver.query(uri, projection, null, null, null);
        if (cursor == null || cursor.getCount() == 0) {
            return null;
        }

        while (cursor.moveToNext()) {
            long channelId = cursor.getLong(0);
            Log.d(TAG, "BUILD CHANNELS FOR "+channelId);
            String channelNumber = cursor.getString(1);
            channelMap.put(channelId, getChannelByNumber(channelNumber, channels));
        }
    } catch (Exception e) {
        Log.d(TAG, "Content provider query: " + e.getStackTrace());
        return null;
    } finally {
        if (cursor != null) {
            cursor.close();
        }
    }
    return channelMap;
}