Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.But
2017-08-17 08:01
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Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.Button.setText(java.lang.CharSequence)' on a null object reference
空指针错误，出现这个错误的原因是因为没有找到相应的view元素，我是由于注入的时候忘记添加R.layout.main所以发生了这类错误
空指针错误，出现这个错误的原因是因为没有找到相应的view元素，我是由于注入的时候忘记添加R.layout.main所以发生了这类错误
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