[Solved] Android Checkbox getchecked (CompoundButton.OnCheckedChangeListener (without button click event))

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You are fetching your CheckBox with 

findViewById(R.id.checkbox);

when in the xml, the id is 

android:id="@+id/checkBox"

The id is case sensitive so check your capitalization. Basically your code is fetching a view by ID and not finding it. Therefore your cb object is set to null and you throw a nullpointer here

cb.setOnCheckedChangeListener(this);

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solved Android Checkbox getchecked (CompoundButton.OnCheckedChangeListener (without button click event))