解除＆＃39;绑定＆＃39;产生NullPointer异常

Question

声明一个Croller数组（https://android-arsenal.com/details/1/5079） -

Croller[] croller = new Croller[]{binding.crollerThirtyOnetwentyHertz,binding.crollerOnetwentyFoursixtyHertz,binding.crollerFoursixtyOnekiloHertz,
                        binding.crollerOnekiloSevenkiloHertz,binding.crollerSevenkiloHertz};

使用它：在使用数据绑定设置Croller的标签时显示Null Pointer Exception

for (int i = 0; i < numBands; i++)
{
    freqRange = eq.getBandFreqRange((short)i);
    croller[i].setLabel ("Anything Printed Here"));
}