TrackManager.java 文件源码

@Override
public void saveData(OutputStream outputStream, FileDataSource source, @Nullable ProgressListener progressListener) throws Exception {
    if (source.tracks.size() != 1)
        throw new Exception("Only single track can be saved in mtrack format");
    Track track = source.tracks.get(0);
    if (progressListener != null)
        progressListener.onProgressStarted(track.points.size());
    CodedOutputStream output = CodedOutputStream.newInstance(outputStream);
    output.writeUInt32(FIELD_VERSION, VERSION);
    int progress = 0;
    for (Track.TrackPoint point : track.points) {
        output.writeTag(FIELD_POINT, WireFormat.WIRETYPE_LENGTH_DELIMITED);
        output.writeRawVarint32(getSerializedPointSize(point));
        output.writeInt32(FIELD_POINT_LATITUDE, point.latitudeE6);
        output.writeInt32(FIELD_POINT_LONGITUDE, point.longitudeE6);
        output.writeFloat(FIELD_POINT_ALTITUDE, point.elevation);
        output.writeFloat(FIELD_POINT_SPEED, point.speed);
        output.writeFloat(FIELD_POINT_BEARING, point.bearing);
        output.writeFloat(FIELD_POINT_ACCURACY, point.accuracy);
        output.writeUInt64(FIELD_POINT_TIMESTAMP, point.time);
        if (!point.continuous)
            //noinspection ConstantConditions
            output.writeBool(8, point.continuous);
        progress++;
        if (progressListener != null)
            progressListener.onProgressChanged(progress);
    }
    output.writeBytes(FIELD_NAME, ByteString.copyFromUtf8(track.name));
    output.writeUInt32(FIELD_COLOR, track.style.color);
    output.writeFloat(FIELD_WIDTH, track.style.width);
    output.flush();
    outputStream.close();
    if (progressListener != null)
        progressListener.onProgressFinished();
}