Legend and title - ability to set chart title and legend

I don’t know if this already exists, or if this should be part of the charts, but I thought I’d suggest these anyway in case it makes sense:

• The ability to set a title that appears somewhere in the LineChart area. Something like chart.setTitle
• The ability to show a legend (eg when using multiple line) indicating what the different line colors mean. I suppose this could be derived from something like Line.setName.

Anyway, thanks for all the work on this chart, it’s very nice and easy to use. The structure of the charts has been well thought out.

[lecho]

Hi, I’m not working on that. I don’t understand what’s the problem and why many people ask about that. Legend can be created as separated view so you and anybody else could create it on your own. It is even a good idea to separate legend from chart view because legend view don’t have to be invalidated so often. Data sharing between chart and legend is also not an issue. What’s more everyone want the legend to look in a different way. So I have no plans to add legend until someone provide or propose some viable solution.

[abdeladim-s]

Hi all, if someone still need to add titles as legend to their charts,this is my own implementation:

public void addTitles(LineChartView chart, List<Line> lines,
   		String[] titles, int textSize, String backgroundColor, int backgrounfAlpha) {
   	if (lines.size() != titles.length) {
   		return;
   	}
   	// set a linear layout container
   	LinearLayout listOfTitles = new LinearLayout(getActivity());
   	listOfTitles.setOrientation(LinearLayout.VERTICAL);
   	LayoutParams LLParams = new LayoutParams(LayoutParams.WRAP_CONTENT,
   			LayoutParams.WRAP_CONTENT);
   	listOfTitles.setLayoutParams(LLParams);
              // set radius corners 
   	GradientDrawable shape = new GradientDrawable();
   	shape.setCornerRadius(8);
   	shape.setColor(Color.parseColor(backgroundColor));
   	shape.setAlpha(backgrounfAlpha);
   	listOfTitles.setBackground(shape);

   	TextView[] textViewTitles = new TextView[titles.length];

   	for (int i = 0; i < titles.length; i++) {
   		textViewTitles[i] = new TextView(getActivity());
   		textViewTitles[i].setTextColor(lines.get(i).getColor());
   		textViewTitles[i].setText(titles[i]);
   		textViewTitles[i].setTextSize(textSize);
   		listOfTitles.addView(textViewTitles[i]);
   	}

   	// get chart parent
   	ViewGroup v = (ViewGroup) chart.getParent();

   	v.addView(listOfTitles);

   	listOfTitles.bringToFront();
   	
   	// make the view draggable 
   	listOfTitles.setOnTouchListener(this);

   }

if you want to make the legend draggable : 1 - add implements OnTouchListener to your activity and then :

        float dX = 0;
	float dY = 0;
	@Override
	public boolean onTouch(View view, MotionEvent event) {
		switch (event.getActionMasked()) {
		case MotionEvent.ACTION_DOWN:
			dX = view.getX() - event.getRawX();
			dY = view.getY() - event.getRawY();
			break;

		case MotionEvent.ACTION_MOVE:
			view.setY(event.getRawY() + dY);
			view.setX(event.getRawX() + dX);
			break;

		default:
			return false;
		}
		return true;
	}

Thanks @lecho for the library!