java.lang.NullPointerException: Attempt to invoke virtual method 'void 、Handler.removeMessages(int)' on a null object reference

onDestory进行释放Handler时，需要判断null

if(null != mHandler) {

            mHandler.removeMessages(MSG_CHANGE_TEXT_COLOR);

            mHandler.removeMessages(MSG_JUMP_TO_SUCCESS_PAGE);

            mHandler.removeMessages(MSG_PLAY_LITTLE_PEOPLE_ANIMATION);

            mHandler.removeMessages(MSG_PLAY_WRONG_ANIMATION);

            mHandler.removeMessages(MSG_SPEAK_BUTTON_STATE_CHANGED);

            mHandler = null;

            DebugLog.d(TAG, "release Handler success");

}