Show value when tapped [MPAndroidChart]

Question

I`ve been looking for a way to enable the MPAndroidChart to only display the value(label) of data point when clicked. But It seems that I could not find it online even in the documentation.

I used the line chart and what I want is to only display the label of the certain point when clicked.

Answer 1

1- Enable touch in the chart

chart.setTouchEnabled(true);

2 - Create MarkerView

public class CustomMarkerView extends MarkerView {

    private TextView tvContent;
    public CustomMarkerView (Context context, int layoutResource) {
        super(context, layoutResource);
        // this markerview only displays a textview
        tvContent = (TextView) findViewById(R.id.tvContent);
    }

    // callbacks everytime the MarkerView is redrawn, can be used to update the
    // content (user-interface)
    @Override
    public void refreshContent(Entry e, Highlight highlight) {
        tvContent.setText("" + e.getVal()); // set the entry-value as the display text
    }

    @Override
    public int getXOffset() {
        // this will center the marker-view horizontally
        return -(getWidth() / 2);
    }

    @Override
    public int getYOffset() {
        // this will cause the marker-view to be above the selected value
        return -getHeight();
    }
}

3 - Create the tvContent view

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="wrap_content"
    android:layout_height="40dp"
    android:background="@drawable/markerImage" >

    <TextView
        android:id="@+id/tvContent"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="7dp"
        android:layout_marginLeft="5dp"
        android:layout_marginRight="5dp"
        android:text=""
        android:textSize="12dp"
        android:textColor="@android:color/white"
        android:ellipsize="end"
        android:singleLine="true"
        android:textAppearance="?android:attr/textAppearanceSmall" />

</RelativeLayout>

4. Set the view Marker in the chart

CustomMarkerView mv = new CustomMarkerView (Context, R.layout.custom_marker_view_layout);
chart.setMarkerView(mv);

https://github.com/PhilJay/MPAndroidChart/wiki/MarkerView