It is very simple, all you have to do is use OnChartValueSelectedListener and start a new Activity from the callback methods.
You can find an example of how this works here .
Basically, implement a listener in your class that contains a diagram:
public class SomeClass implements OnChartValueSelectedListener {
Set the listener to the graph:
chart.setOnChartValueSelectedListener(this);
Run the new action in the callback:
@Override public void onValueSelected(Entry e, int dataSetIndex, Highlight h) {
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