具有baseAdapter和livedata viewmodel的多个GraphView

Question

我正在尝试使用GraphView库绘制实时图形。该示例显示了两种方法-resetData和appendData。这两种方法之间的区别如下

resetData 此方法将重置整个数据，因此当前数据将被新的替换。 appendData ：此方法将单个数据集添加到当前数据。还有一个标志“ scrollToEnd”，它将自动将GraphView滚动到最后一个X值。

他们的LineGraphSeries的初始化也就是differentenet

private LineGraphSeries<DataPoint> mSeries1; // resetData 
private LineGraphSeries<> mSeries2; // appendData 

现在，我在MainActivity中创建一个这样的LineGraphSeries数组，并将传感器数据附加到每个LineGraphSeries。

// pitch, yaw and roll, external sensor.         
LineGraphSeries<>[] gyroDataArray = new LineGraphSeries[8]; 
LineGraphSeries<DataPoint>[] gyroDataArray= new LineGraphSeries[8];

我要在viewModels中添加传感器值

gyroDataArray[0].appendData(new DataPoint(index,sensorRealtimeData.getPitch()), true,50);
gyroDataArray[1].appendData(new DataPoint(index,sensorRealtimeData.getRoll()), true,50);
gyroDataArray[2].appendData(new DataPoint(index,sensorRealtimeData.getYaw()), true,50); 
index++;

sensorViewModel.setAllData(gyroDataArray);

此后，我在我获取这些值的“片段”中调用观察者-

gyroViewModel.getAllSensorValues().observe(getViewLifecycleOwner(), new Observer<LineGraphSeries<>[]>() {
        @Override
        public void onChanged(@Nullable LineGraphSeries<>[] lineGraphSeriesArray) {
            updateSensorGraph(lineGraphSeriesArray);
        }
    });

private void updateSensorGraph(LineGraphSeries<>[] lineGraphSeriesArray){
    sensorAdapter = new GraphAdapter(getActivity(),lineGraphSeriesArray);
    sensorGraphs.setAdapter(sensorAdapter );
}

现在这在我的适配器内。我在这里看不到任何图形，但是我可以记录所有值...

public class GraphAdapter extends BaseAdapter {
    private Context ctx;
    private LineGraphSeries<>[] lineGraphSeriesArray;

    public GraphAdapter(Context ctx, LineGraphSeries<>[] lineGraphSeriesArray) {
        this.ctx = ctx;
        this.lineGraphSeriesArray = lineGraphSeriesArray;
    }

    @Override
    public int getCount() {
        return lineGraphSeriesArray.length;
    }

    @Override
    public LineGraphSeries<> getItem(int position) {
        return lineGraphSeriesArray[position];
    }

    @Override
    public long getItemId(int position) {
        return position;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        View graphview = convertView;
        if (graphview == null) {
            LayoutInflater inflater = (LayoutInflater) ctx.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            assert inflater != null;
            graphview = inflater.inflate(R.layout.graphcard, null);
        }

        GraphView graph = (GraphView) graphview.findViewById(R.id.graphs);
        graph.addSeries(getItem(position));
        graph.getViewport().setXAxisBoundsManual(true);
        graph.getViewport().setMinX(0);
        graph.getViewport().setMaxX(40);
        Log.d("GYRO graphs",getItem(position).toString());
        return graphview;
    }

}