如何通过单击Android中的刷新按钮以新值更新饼图

Question

How to update a pie chart with new values when I click a refresh button.

That means I want to remove old pie chart and create a new pie chart by clicking a button in the same activity.Here I am using A chart engine for displaying pie chart.

Thanks in advance..

Answer 1

Call this code on the button click.

Intent intent = getIntent();
finish();
//here you get new data for the pie chart.
startActivity(intent);

Basically you have to restart the activity, if you use the above code.

Now if you can get data in a thread then try considering , AsyncTask and get the new data inside the doInBackground method. And after calling onPostExecute refresh the UI part making a new object display ie View in your case.

Answer 2

You will have to remove the old data from your dataset and add the new values. Once done this, just call mChartView.repaint() in order to do the visual refresh.