NullPointerException at TextView.checkForRelayout() while setText()

Question

I am trying to implement ViewHolder pattern to improve perfomance while drawing on canvas over the map. I need to create some labels for my markers. This method is called while data processing in `draw()` ``` // now we create label view and convert it into bitmap private Bitmap createLabelBitmap(GisLaborHistoryObject object, HistoryPoint point) { // create view from xml if (vh == null) { vh = new ViewHolder(); vh.view = inflater.inflate(R.layout.map_gis_history_label, null, false); vh.tv = (TextView) vh.view.findViewById(R.id.gislabeltext); } // set label content if (vh.tv != null) { if (!mSingleLaborHistory) { String name = ""; name = object.getDisplayName(); if (name == null || "".equals(name)) name = object.getPersonId(); if (name == null || "".equals(name)) name = object.getLaborCode(); if (name == null) name = ""; vh.tv.setText(name); } else vh.tv.setText(point.getChangeDate()); } // measure resulting view vh.view.measure(spec, spec); vh.view.layout(0, 0, vh.view.getMeasuredWidth…

Accepted Answer

After looking into android source code at line 5497 I noticed that there is a check using mLayoutParams. I looked whis case in the debug mode and it is really was null! I add line which explicitly set this params. Now everything works fine.

```
vh.tv = (TextView) vh.view.findViewById(R.id.gislabeltext);
vh.tv.setLayoutParams(new ViewGroup.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));
```

My error was that I had have to set LayoutParams explicitly while inflating with ViewGroup root = null; Everything had worked fine until I tried to reuse TextView multiple times.

NullPointerException at TextView.checkForRelayout() while setText()

Solution

Problem