How to not draw zero values on a linechart while showing their X axis values on MPAndroidChart?

Question

I'm using MPAndroidChart to display my data in a line graph. For each date I have its own value.

This works just fine. What I want to do now is to not draw the 0 values, but instead draw the line between 2 adjacent non-zero values (like a trend-line), while keep showing the dates on the x-axis for the zero values.

My current graph:

The desired graph should look similar to this graph:

How can I achieve this behavior?

Vishinsky

Answer 1

I'm posting my friend's solution here (worked like a charm):

1. Create a dataset with 0 values. Draw it but with line of transparent color.
2. Create a dataset without 0. Draw it with the color that you need.

Put (1) and (2) on the same LineChart.

It will give you an x axis with x values where there are 0 values but will not draw a line for them.

The second dataset will show the line of data points without the 0 values.

Vishinsky

Great! Can you please post it as an answer to this question as well? – Charlot

Answer 2

Without drawing two lines like limlim suggested, you have to add only non zero values to your entries, but the x value has to be incremented anyway:

List<SomeClass> values = new ArrayList<>();

int k = 0;
List<Entry> entries = new ArrayList<>();
for (SomeClass v : values){
  if (v.value > 0){
    entries.add(new Entry(k, v.value));
  }
  k += 1;
}

Ible

Answer 3

There is no need to split dataset to draw empty points for MPAndroidChart:v3.1.0. All you have to do is set those empty points value as Float.NaN (in case of Kotlin).

Bury

This does not provide an answer to the question. Once you have sufficient reputation you will be able to comment on any post; instead, provide answers that don't require clarification from the asker. - From Review – Piety